diff --git a/theme.go b/theme.go
index 6cf01dd..f459707 100644
--- a/theme.go
+++ b/theme.go
@@ -29,9 +29,18 @@ type Color int; const (
 	// ColorForeground is the text/icon color of the theme.
 	ColorForeground
 
+	// ColorMidground is a generic raised element color.
+	ColorMidground
+
 	// ColorBackground is the background color of the theme.
 	ColorBackground
 
+	// ColorShadow is a generic shadow color.
+	ColorShadow
+
+	// ColorShine is a generic highlight color.
+	ColorShine
+
 	// ColorAccent is the accent color of the theme.
 	ColorAccent
 )