Index: wp-includes/admin-bar.php
===================================================================
--- wp-includes/admin-bar.php	(revision 20649)
+++ wp-includes/admin-bar.php	(working copy)
@@ -573,6 +573,9 @@
 	if ( current_user_can( 'switch_themes' ) || current_user_can( 'edit_theme_options' ) )
 		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'themes', 'title' => __('Themes'), 'href' => admin_url('themes.php') ) );
 
+	if ( current_user_can( 'switch_themes' ) || current_user_can( 'edit_theme_options' ) )
+		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'customize', 'title' => __('Customize'), 'href' => admin_url('admin.php?customize=on&theme=' . wp_get_theme()->get_stylesheet()) ) );
+
 	if ( ! current_user_can( 'edit_theme_options' ) )
 		return;