diff --git a/LayerBasedTheme.cpp b/LayerBasedTheme.cpp
new file mode 100644
index 0000000..8754342
--- /dev/null
+++ b/LayerBasedTheme.cpp
@@ -0,0 +1,31 @@
+#include "LayerBasedTheme.h"
+
+#include "kaleidoscope/layers.h"
+#include "kaleidoscope/plugin/LEDControl.h"
+
+namespace kaleidoscope {
+namespace plugin {
+    EventHandlerResult LayerBasedTheme::onLayerChange() {
+        uint8_t current_layer = Layer.mostRecent();
+        uint8_t current_mode =::LEDControl.get_mode_index();
+        uint8_t new_mode;
+
+        if (current_layer <= 3) {
+            new_mode = 2;
+        } else {
+            new_mode = 3;
+        }
+
+        if (new_mode != current_mode) {
+            ::LEDControl.set_mode(new_mode);
+        }
+
+        return EventHandlerResult::OK;
+    }
+
+    LayerBasedTheme::TransientLEDMode::TransientLEDMode(const LayerBasedTheme *parent)
+            : parent_(parent) {};
+} // namespace plugin
+} // namespace kaleidoscope
+
+kaleidoscope::plugin::LayerBasedTheme LayerBasedTheme;
diff --git a/LayerBasedTheme.h b/LayerBasedTheme.h
new file mode 100644
index 0000000..5cfe2e7
--- /dev/null
+++ b/LayerBasedTheme.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "kaleidoscope/event_handler_result.h"
+#include "kaleidoscope/plugin.h"
+#include "kaleidoscope/plugin/AccessTransientLEDMode.h"
+#include "kaleidoscope/plugin/LEDModeInterface.h"
+#include "kaleidoscope/plugin/LEDMode.h"
+
+namespace kaleidoscope {
+namespace plugin {
+class LayerBasedTheme : public Plugin,
+                          public LEDModeInterface,
+                          public AccessTransientLEDMode {
+ public:
+  LayerBasedTheme(void) {}
+
+  EventHandlerResult onLayerChange();
+
+  class TransientLEDMode : public LEDMode {
+    public:
+      explicit TransientLEDMode(const LayerBasedTheme *parent);
+  private:
+      const LayerBasedTheme *parent_;
+  };
+};
+} // namespace plugin
+} // namespace kaleidoscope
+
+extern kaleidoscope::plugin::LayerBasedTheme LayerBasedTheme;
diff --git a/Model100.ino b/Model100.ino
index 04c4517..c916e09 100644
--- a/Model100.ino
+++ b/Model100.ino
@@ -24,6 +24,8 @@
 #include "Kaleidoscope-MagicCombo.h"
 #include "Kaleidoscope-USB-Quirks.h"
 
+#include "LayerBasedTheme.h"
+
 enum {
   MACRO_VERSION_INFO,
   MACRO_ANY,
@@ -296,7 +298,9 @@ KALEIDOSCOPE_INIT_PLUGINS(
   MouseKeys,
   HostPowerManagement,
   MagicCombo,
-  USBQuirks);
+  USBQuirks,
+  LayerBasedTheme
+);
 
 void setup() {
   Kaleidoscope.setup();