diff -ur src/xfce_theme_draw.c src/xfce_theme_draw.c
--- src/xfce_theme_draw.c	2011-01-16 16:40:26.000000000 +0100
+++ src/xfce_theme_draw.c	2011-02-26 02:42:51.440000006 +0100
@@ -424,6 +424,65 @@
     }
 }
 
+static GdkPixbuf * xfce_set_transparency (GdkPixbuf * src, gfloat alpha)
+{
+    GdkPixbuf *dst;
+    guchar *data, *current;
+    guint x, y, rowstride, height, width;
+
+    g_return_val_if_fail(src != NULL, NULL);
+    g_return_val_if_fail(GDK_IS_PIXBUF (src), NULL);
+
+    dst = gdk_pixbuf_add_alpha (src, FALSE, 0, 0, 0);
+
+    width = gdk_pixbuf_get_width(dst);
+    height = gdk_pixbuf_get_height(dst);
+    rowstride = gdk_pixbuf_get_rowstride(dst);
+    data = gdk_pixbuf_get_pixels(dst);
+
+    for (y = 0; y < height; y++)
+    {
+        current = data + 3;
+
+        for (x = 0; x < width; x++)
+        {
+            *current *= alpha;
+
+            current += 4;
+        }
+
+        data += rowstride;
+    }
+
+    return dst;
+}
+
+static GdkPixbuf * render_icon (GtkStyle * style, const GtkIconSource * source, GtkTextDirection direction, GtkStateType state, GtkIconSize size, GtkWidget * widget, const gchar * detail)
+{
+    GdkPixbuf *scaled, *stated;
+    GtkStateType render_state = state;
+
+    if (state == GTK_STATE_INSENSITIVE)
+    {
+        render_state = GTK_STATE_NORMAL;
+    }
+
+    scaled = parent_class->render_icon(style, source, direction, render_state, size, widget, detail);
+
+    if (state == GTK_STATE_INSENSITIVE && scaled != NULL)
+    {
+        stated = xfce_set_transparency(scaled, 0.5);
+
+        gdk_pixbuf_saturate_and_pixelate(stated, stated, 0.5, FALSE);
+
+        g_object_unref(scaled);
+
+        scaled = stated;
+    }
+
+    return scaled;
+}
+
 static void draw_hline(GtkStyle * style, GdkWindow * window, GtkStateType state_type, GdkRectangle * area, GtkWidget * widget, const gchar * detail, gint x1, gint x2, gint y)
 {
     gint thickness_light;
@@ -1380,6 +1439,7 @@
     GtkStyleClass *style_class = GTK_STYLE_CLASS(klass);
 
     parent_class = g_type_class_peek_parent(klass);
+    style_class->render_icon = render_icon;
     style_class->draw_hline = draw_hline;
     style_class->draw_vline = draw_vline;
     style_class->draw_shadow = draw_shadow;