diff --git a/frontend/src/lib/search.ts b/frontend/src/lib/search.ts
index 2b5f4e6..ab1545f 100644
--- a/frontend/src/lib/search.ts
+++ b/frontend/src/lib/search.ts
@@ -45,7 +45,13 @@ export const SEARCH_INDEX: SearchHit[] = [
 	{
 		page: "appearance",
 		label: "Wallpaper",
-		keywords: "wallpaper theme palette pywal breadpaper accent",
+		keywords: "wallpaper theme palette pywal breadpaper accent per monitor multi monitor background",
+	},
+	{
+		page: "appearance",
+		tab: "shelltheme",
+		label: "Shell theme",
+		keywords: "shell theme breadbar breadbox bar launcher style liquid motion glass workbench spotlight daylight layout animation",
 	},
 	{
 		page: "appearance",
diff --git a/frontend/src/lib/views/AppearanceHub.svelte b/frontend/src/lib/views/AppearanceHub.svelte
index 692f3ea..e8e2e1f 100644
--- a/frontend/src/lib/views/AppearanceHub.svelte
+++ b/frontend/src/lib/views/AppearanceHub.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 	import Hub from "$lib/components/Hub.svelte";
 	import Breadpaper from "./Breadpaper.svelte";
+	import ShellTheme from "./ShellTheme.svelte";
 	import Appearance from "./Appearance.svelte";
 </script>
 
@@ -9,6 +10,7 @@
 	lede="Wallpaper sets the colors. Windows follow."
 	tabs={[
 		{ id: "breadpaper", label: "Wallpaper", component: Breadpaper },
+		{ id: "shelltheme", label: "Shell theme", component: ShellTheme },
 		{ id: "appearance", label: "Windows", component: Appearance },
 	]}
 />
diff --git a/frontend/src/lib/views/Breadpaper.svelte b/frontend/src/lib/views/Breadpaper.svelte
index d94cd39..b4abb31 100644
--- a/frontend/src/lib/views/Breadpaper.svelte
+++ b/frontend/src/lib/views/Breadpaper.svelte
@@ -4,25 +4,57 @@
 	import { open } from "@tauri-apps/plugin-dialog";
 	import ViewScaffold from "$lib/components/ViewScaffold.svelte";
 	import Group from "$lib/components/Group.svelte";
+	import SwitchField from "$lib/components/SwitchField.svelte";
 
 	interface LibraryEntry {
 		path: string;
 		name: string;
 	}
+	interface LiveMonitor {
+		name: string;
+		mode: string;
+	}
+	interface OutputWallpaper {
+		output: string;
+		path: string;
+	}
+
+	let monitors = $state<LiveMonitor[]>([]);
+	let byOutput = $state<Record<string, string>>({});
+	let globalPath = $state<string | null>(null);
+	let selected = $state<string | null>(null);
+	let sameOnAll = $state(true);
 
-	let currentPath = $state<string | null>(null);
 	let status = $state("");
 	let libraryDir = $state("");
 	let library = $state<LibraryEntry[] | null>(null);
 	let scanning = $state(false);
 
-	async function refreshCurrent() {
-		currentPath = await invoke<string | null>("get_current_wallpaper");
+	// The wallpaper the current selection resolves to: the global one when
+	// "same on every monitor" is on, otherwise the selected monitor's own
+	// (falling back to the global if that monitor was never set explicitly).
+	let activePath = $derived(
+		sameOnAll ? globalPath : (selected && byOutput[selected]) || globalPath,
+	);
+
+	const perMonitor = $derived(monitors.length > 1);
+
+	async function refresh() {
+		globalPath = await invoke<string | null>("get_current_wallpaper");
+		const list = await invoke<OutputWallpaper[]>("get_wallpapers_by_output");
+		byOutput = Object.fromEntries(list.map((o) => [o.output, o.path]));
+		monitors = await invoke<LiveMonitor[]>("get_live_monitors");
+		if (!selected || !monitors.some((m) => m.name === selected)) {
+			selected = monitors[0]?.name ?? null;
+		}
 	}
 
 	onMount(async () => {
 		libraryDir = await invoke<string>("wallpaper_library_dir_display");
-		await refreshCurrent();
+		await refresh();
+		// Start in per-monitor mode only if the monitors genuinely disagree.
+		const distinct = new Set(Object.values(byOutput));
+		sameOnAll = distinct.size <= 1;
 		scanning = true;
 		try {
 			library = await invoke<LibraryEntry[]>("list_wallpaper_library");
@@ -34,8 +66,12 @@
 	async function apply(path: string) {
 		status = "Setting…";
 		try {
-			await invoke("set_wallpaper", { path });
-			await refreshCurrent();
+			if (sameOnAll || !selected) {
+				await invoke("set_wallpaper", { path });
+			} else {
+				await invoke("set_wallpaper_on", { output: selected, path });
+			}
+			await refresh();
 			status = "Set";
 		} catch (e) {
 			status = `${e}`;
@@ -51,13 +87,39 @@
 		});
 		if (typeof path === "string") await apply(path);
 	}
+
+	function shortName(p: string | null): string {
+		return p ? (p.split("/").pop() ?? p) : "";
+	}
 </script>
 
 <ViewScaffold title="Wallpaper">
-	<Group title="Wallpaper" hint="This also updates desktop colors.">
-		{#if currentPath}
-			<div class="hero" style="background-image: url('{convertFileSrc(currentPath)}')">
-				<span class="cap">{currentPath.split("/").pop()}</span>
+	<Group title="Wallpaper" hint="This also sets the desktop colors — each monitor's accent comes from its own wallpaper.">
+		{#if perMonitor}
+			<SwitchField label="Use the same wallpaper on every monitor" bind:value={sameOnAll} />
+		{/if}
+
+		{#if perMonitor && !sameOnAll}
+			<div class="mons">
+				{#each monitors as m (m.name)}
+					<button
+						type="button"
+						class="mon"
+						class:on={selected === m.name}
+						title={m.mode}
+						onclick={() => (selected = m.name)}
+					>
+						{m.name}
+					</button>
+				{/each}
+			</div>
+		{/if}
+
+		{#if activePath}
+			<div class="hero" style="background-image: url('{convertFileSrc(activePath)}')">
+				<span class="cap">
+					{#if perMonitor && !sameOnAll}{selected} · {/if}{shortName(activePath)}
+				</span>
 			</div>
 		{:else}
 			<div class="hero placeholder">No wallpaper</div>
@@ -78,7 +140,7 @@
 				{#each library as item (item.path)}
 					<button
 						class="thumb"
-						class:on={item.path === currentPath}
+						class:on={item.path === activePath}
 						onclick={() => apply(item.path)}
 						title={item.path}
 					>
@@ -91,6 +153,30 @@
 </ViewScaffold>
 
 <style>
+	.mons {
+		display: flex;
+		flex-wrap: wrap;
+		gap: 6px;
+		margin: 4px 0 12px;
+	}
+
+	.mon {
+		padding: 6px 11px;
+		border-radius: 999px;
+		font-size: 12px;
+		background: color-mix(in srgb, var(--fg) 6%, transparent);
+		border: 1px solid var(--line, color-mix(in srgb, var(--fg) 8%, transparent));
+		color: var(--fg);
+		cursor: pointer;
+	}
+
+	.mon.on {
+		background: var(--accent);
+		color: var(--on-accent);
+		border-color: transparent;
+		font-weight: 600;
+	}
+
 	.hero {
 		height: 180px;
 		border-radius: 12px;
diff --git a/frontend/src/lib/views/ShellTheme.svelte b/frontend/src/lib/views/ShellTheme.svelte
new file mode 100644
index 0000000..7965c30
--- /dev/null
+++ b/frontend/src/lib/views/ShellTheme.svelte
@@ -0,0 +1,187 @@
+<script lang="ts">
+	import { onMount } from "svelte";
+	import { invoke } from "@tauri-apps/api/core";
+	import ViewScaffold from "$lib/components/ViewScaffold.svelte";
+	import Group from "$lib/components/Group.svelte";
+	import Hint from "$lib/components/Hint.svelte";
+
+	interface ShellThemeInfo {
+		id: string;
+		name: string;
+		source: string; // "builtin" | "system" | "user"
+	}
+
+	let themes = $state<ShellThemeInfo[]>([]);
+	let active = $state<string>("");
+	let loaded = $state(false);
+	let busy = $state(false);
+	let status = $state("");
+	// Set once the user switches, so the restart prompt gains emphasis.
+	// breadbar/breadbox don't hot-reload a shell-theme change today — it
+	// takes effect when they restart or on the next login.
+	let switched = $state(false);
+
+	onMount(async () => {
+		[themes, active] = await Promise.all([
+			invoke<ShellThemeInfo[]>("list_shell_themes"),
+			invoke<string>("get_active_shell_theme"),
+		]);
+		loaded = true;
+	});
+
+	async function select(id: string) {
+		if (id === active || busy) return;
+		const prev = active;
+		active = id;
+		busy = true;
+		status = "Applying…";
+		try {
+			await invoke("set_active_shell_theme", { id });
+			switched = true;
+			status = "Applied";
+			setTimeout(() => (status = ""), 3000);
+		} catch (e) {
+			active = prev;
+			status = `${e}`;
+		} finally {
+			busy = false;
+		}
+	}
+
+	async function restart() {
+		busy = true;
+		status = "Restarting…";
+		try {
+			await invoke("restart_shell_apps");
+			switched = false;
+			status = "Restarted";
+			setTimeout(() => (status = ""), 3000);
+		} catch (e) {
+			status = `${e}`;
+		} finally {
+			busy = false;
+		}
+	}
+</script>
+
+<ViewScaffold
+	title="Shell theme"
+	lede="The layout and motion style for the bar and launcher. Colors come from the wallpaper."
+>
+	<Group title="Theme" wide>
+		{#if !loaded}
+			<Hint text="Loading…" />
+		{:else}
+			<div class="cards">
+				{#each themes as t (t.id)}
+					<button
+						type="button"
+						class="card"
+						class:on={active === t.id}
+						disabled={busy}
+						onclick={() => select(t.id)}
+					>
+						<span class="dot" aria-hidden="true"></span>
+						<span class="meta">
+							<span class="name">{t.name}</span>
+							<span class="sub">
+								<span class="id">{t.id}</span>{#if t.source !== "builtin"} · {t.source}{/if}
+							</span>
+						</span>
+					</button>
+				{/each}
+			</div>
+			<div class="foot">
+				<span class="status">{status}</span>
+			</div>
+		{/if}
+	</Group>
+
+	{#if loaded}
+		<Group title="Apply">
+			<Hint
+				text={switched
+					? "The bar restarts itself to pick up the new theme; the launcher applies it next time you open it."
+					: "The bar restarts itself on a theme change; the launcher applies it on its next open. Use the button below if something looks stuck."}
+			/>
+			<div class="foot">
+				<button class="btn" disabled={busy} onclick={restart}>Restart bar &amp; launcher</button>
+			</div>
+		</Group>
+	{/if}
+</ViewScaffold>
+
+<style>
+	.cards {
+		display: grid;
+		grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+		gap: 8px;
+	}
+
+	.card {
+		display: flex;
+		align-items: center;
+		gap: 10px;
+		padding: 12px 14px;
+		border-radius: 10px;
+		text-align: left;
+		background: var(--bg);
+		border: 2px solid transparent;
+		color: inherit;
+		cursor: pointer;
+	}
+
+	.card:disabled {
+		cursor: default;
+		opacity: 0.7;
+	}
+
+	.card.on {
+		border-color: var(--accent);
+	}
+
+	.dot {
+		width: 10px;
+		height: 10px;
+		border-radius: 999px;
+		flex-shrink: 0;
+		background: color-mix(in srgb, var(--fg) 25%, transparent);
+	}
+
+	.card.on .dot {
+		background: var(--accent);
+	}
+
+	.meta {
+		display: flex;
+		flex-direction: column;
+		min-width: 0;
+	}
+
+	.name {
+		font-size: 14px;
+	}
+
+	.sub {
+		font-size: 11px;
+		color: var(--muted);
+		text-transform: capitalize;
+	}
+
+	.sub .id {
+		text-transform: none;
+		font-family: var(--font-mono, ui-monospace, monospace);
+	}
+
+	.foot {
+		display: flex;
+		align-items: center;
+		gap: 12px;
+		margin-top: 12px;
+	}
+
+	.status {
+		color: var(--muted);
+		font-size: 12px;
+	}
+</style>
diff --git a/src/Cargo.lock b/src/Cargo.lock
index bf1adc3..b39041a 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -307,12 +307,15 @@ dependencies = [
 
 [[package]]
 name = "bread-theme"
-version = "0.7.4"
-source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?tag=v0.7.4#fcba3760387e2523edb71350f8efea3bc851b21e"
+version = "0.7.5"
+source = "git+https://git.breadway.dev/Breadway/bread-ecosystem?tag=v0.7.5#46b886b7bc168e73945269e143b18ef8a0d987f8"
 dependencies = [
+ "anyhow",
  "dirs 5.0.1",
  "serde",
  "serde_json",
+ "toml 0.8.23",
+ "tracing",
 ]
 
 [[package]]
diff --git a/src/Cargo.toml b/src/Cargo.toml
index c74d506..827a489 100644
--- a/src/Cargo.toml
+++ b/src/Cargo.toml
@@ -36,7 +36,7 @@ toml_edit = "0.22"
 tokio = { version = "1", features = ["process", "io-util", "time", "macros"] }
 notify = "7"
 regex = "1"
-bread-theme = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", tag = "v0.7.4" }
+bread-theme = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", tag = "v0.7.5" }
 bread-utils = { git = "https://git.breadway.dev/Breadway/bread-ecosystem", tag = "v0.7.2", features = ["toml"] }
 anyhow = "1"
 
diff --git a/src/src/commands/breadpaper.rs b/src/src/commands/breadpaper.rs
index 62a48f5..39c7a0c 100644
--- a/src/src/commands/breadpaper.rs
+++ b/src/src/commands/breadpaper.rs
@@ -84,6 +84,64 @@ pub async fn set_wallpaper(path: String) -> Result<(), String> {
     }
 }
 
+/// One compositor output's persisted wallpaper, from breadpaper's own
+/// `~/.config/breadpaper/current.json` (`{ "outputs": { "<name>": "<path>" } }`).
+#[derive(Serialize)]
+pub struct OutputWallpaper {
+    output: String,
+    path: String,
+}
+
+fn current_json_path() -> PathBuf {
+    super::config::config_dir().join("breadpaper/current.json")
+}
+
+/// The wallpaper breadpaper last set on each output. Read straight from
+/// `current.json` rather than shelling `breadpaper --output <n> get` once
+/// per monitor — it's the same file breadpaper's `get_on` reads, and a
+/// settings window can have several monitors to report.
+#[tauri::command]
+pub fn get_wallpapers_by_output() -> Vec<OutputWallpaper> {
+    let Ok(text) = std::fs::read_to_string(current_json_path()) else {
+        return Vec::new();
+    };
+    let Ok(value) = serde_json::from_str::<serde_json::Value>(&text) else {
+        return Vec::new();
+    };
+    let Some(outputs) = value.get("outputs").and_then(|v| v.as_object()) else {
+        return Vec::new();
+    };
+    outputs
+        .iter()
+        .filter_map(|(output, path)| {
+            Some(OutputWallpaper {
+                output: output.clone(),
+                path: path.as_str()?.to_string(),
+            })
+        })
+        .collect()
+}
+
+/// Set the wallpaper (and regenerate that output's pywal palette) on a
+/// single compositor output. `breadpaper --output <NAME> set <path>`
+/// leaves every other output's wallpaper untouched (see breadpaper's
+/// `current.json` `set_one_output_does_not_drop_others` test).
+#[tauri::command]
+pub async fn set_wallpaper_on(output: String, path: String) -> Result<(), String> {
+    let ok = Command::new("breadpaper")
+        .args(["--output", &output, "set"])
+        .arg(&path)
+        .status()
+        .await
+        .map(|s| s.success())
+        .unwrap_or(false);
+    if ok {
+        Ok(())
+    } else {
+        Err("breadpaper failed — see terminal/journal".into())
+    }
+}
+
 #[derive(Serialize)]
 pub struct LibraryEntry {
     path: String,
diff --git a/src/src/commands/mod.rs b/src/src/commands/mod.rs
index e1c5a29..c3254e7 100644
--- a/src/src/commands/mod.rs
+++ b/src/src/commands/mod.rs
@@ -34,6 +34,7 @@ pub mod packages;
 pub mod power;
 pub mod printing;
 pub mod service;
+pub mod shell_theme;
 pub mod snapshots;
 pub mod sound;
 pub mod streaming;
diff --git a/src/src/commands/shell_theme.rs b/src/src/commands/shell_theme.rs
new file mode 100644
index 0000000..94267de
--- /dev/null
+++ b/src/src/commands/shell_theme.rs
@@ -0,0 +1,144 @@
+//! `~/.config/bread/shell.toml` — the `active = "<id>"` key selects the
+//! **shell theme**: breadbar/breadbox chrome, layout, and animation style
+//! (`liquid-motion`, `glass-workbench`, `spotlight`, `daylight`). This is a
+//! single global selector; per-monitor differences come from the wallpaper
+//! and its pywal palette, not from the shell theme.
+//!
+//! `bread_theme::shell::list()` enumerates every discoverable theme (user
+//! config → system dir → compiled-in builtins). Setting `active` is a
+//! non-destructive `toml_edit` write.
+//!
+//! A running breadbar watches `shell.toml` (`bread_theme::shell::watch()`)
+//! and, on an `active` change, re-execs itself so the full theme applies —
+//! geometry and widget structure, not just CSS tokens. breadbox re-reads
+//! the theme on each launcher open. So a plain write here is normally
+//! enough; `restart_shell_apps` stays as a manual fallback (an old breadbar
+//! without self-restart, or a failed re-exec).
+
+use serde::Serialize;
+
+use super::config;
+
+fn shell_toml_path() -> std::path::PathBuf {
+    config::config_dir().join("bread/shell.toml")
+}
+
+/// Default when `shell.toml` is missing or has no `active` — matches
+/// `bread_theme::shell`'s own hardcoded fallback.
+const DEFAULT_THEME_ID: &str = "liquid-motion";
+
+#[derive(Serialize)]
+pub struct ShellThemeInfo {
+    id: String,
+    name: String,
+    /// `"builtin"`, `"system"`, or `"user"` — for a source badge in the picker.
+    source: String,
+}
+
+#[tauri::command]
+pub fn list_shell_themes() -> Vec<ShellThemeInfo> {
+    bread_theme::shell::list()
+        .into_iter()
+        .map(|t| ShellThemeInfo {
+            id: t.id,
+            name: t.name,
+            source: match t.source {
+                bread_theme::shell::ThemeSource::User => "user",
+                bread_theme::shell::ThemeSource::System => "system",
+                bread_theme::shell::ThemeSource::Builtin => "builtin",
+            }
+            .to_string(),
+        })
+        .collect()
+}
+
+#[tauri::command]
+pub fn get_active_shell_theme() -> String {
+    let doc = config::load_doc(&shell_toml_path());
+    doc.get("active")
+        .and_then(|i| i.as_str())
+        .map(str::trim)
+        .filter(|s| !s.is_empty())
+        .map(str::to_string)
+        .unwrap_or_else(|| DEFAULT_THEME_ID.to_string())
+}
+
+/// Writes `active = "<id>"` into `shell.toml`, preserving any other keys and
+/// comments. Rejects an id that isn't a discoverable theme — a typo would
+/// silently fall breadbar/breadbox back to the builtin with no error.
+#[tauri::command]
+pub fn set_active_shell_theme(id: String) -> Result<(), String> {
+    if !bread_theme::shell::list().iter().any(|t| t.id == id) {
+        return Err(format!("no shell theme with id '{id}'"));
+    }
+    let path = shell_toml_path();
+    let mut doc = config::load_doc(&path);
+    doc["active"] = toml_edit::value(id);
+    config::save_doc(&path, &doc).map_err(|e| e.to_string())
+}
+
+/// Restart breadbar and breadbox so a shell-theme change takes full effect:
+/// breadbar's live watch handles colours/tokens but not window geometry
+/// (anchors, exclusive zone), and breadbox has no watch at all. Detached so
+/// the new processes outlive this settings process. Best-effort — a missing
+/// binary or a compositor without them running is not an error.
+#[tauri::command]
+pub fn restart_shell_apps() -> Result<(), String> {
+    for app in ["breadbar", "breadbox"] {
+        let _ = std::process::Command::new("pkill").args(["-x", app]).status();
+    }
+    std::thread::sleep(std::time::Duration::from_millis(250));
+    spawn_detached("breadbar", &[]);
+    // Matches `~/.config/hypr/autostart.json` — breadbox runs as a command
+    // bus (`breadbox listen`); the launcher window is spawned on demand.
+    spawn_detached("breadbox", &["listen"]);
+    Ok(())
+}
+
+fn spawn_detached(prog: &str, args: &[&str]) {
+    use std::process::{Command, Stdio};
+    // `setsid -f` forks the target into its own session and exits at once;
+    // the target is reparented to init, so it never becomes a zombie of
+    // this settings process. `.status()` reaps `setsid` itself (it returns
+    // immediately) so that doesn't linger either — a plain `.spawn()` here
+    // leaves a `<defunct>` entry behind for every restart.
+    let _ = Command::new("setsid")
+        .arg("-f")
+        .arg(prog)
+        .args(args)
+        .stdin(Stdio::null())
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status();
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::io::Write;
+
+    /// `set`-style write must not drop sibling keys or comments in shell.toml.
+    #[test]
+    fn writing_active_preserves_other_content() {
+        let dir = std::env::temp_dir().join(format!("bos-shelltoml-{}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("shell.toml");
+        let mut f = std::fs::File::create(&path).unwrap();
+        write!(
+            f,
+            "# my shell config\nactive = \"spotlight\"\n\n[experimental]\nfoo = true\n"
+        )
+        .unwrap();
+
+        let mut doc = config::load_doc(&path);
+        doc["active"] = toml_edit::value("daylight");
+        config::save_doc(&path, &doc).unwrap();
+
+        let out = std::fs::read_to_string(&path).unwrap();
+        assert!(out.contains("active = \"daylight\""));
+        assert!(out.contains("# my shell config"));
+        assert!(out.contains("[experimental]"));
+        assert!(out.contains("foo = true"));
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+}
diff --git a/src/src/lib.rs b/src/src/lib.rs
index fe4c347..a37bda1 100644
--- a/src/src/lib.rs
+++ b/src/src/lib.rs
@@ -41,8 +41,14 @@ pub fn run() {
             commands::breadcrumbs::save_breadcrumbs_config,
             commands::breadpaper::get_current_wallpaper,
             commands::breadpaper::set_wallpaper,
+            commands::breadpaper::get_wallpapers_by_output,
+            commands::breadpaper::set_wallpaper_on,
             commands::breadpaper::list_wallpaper_library,
             commands::breadpaper::wallpaper_library_dir_display,
+            commands::shell_theme::list_shell_themes,
+            commands::shell_theme::get_active_shell_theme,
+            commands::shell_theme::set_active_shell_theme,
+            commands::shell_theme::restart_shell_apps,
             commands::appearance::get_appearance,
             commands::appearance::save_appearance,
             commands::autostart::get_autostart_entries,