Index: src/wp-admin/includes/misc.php
===================================================================
--- src/wp-admin/includes/misc.php	(revision 26862)
+++ src/wp-admin/includes/misc.php	(working copy)
@@ -571,7 +571,8 @@
 		$_wp_admin_css_colors = array_filter( array_merge( array( 'fresh' => '', 'light' => '' ), $_wp_admin_css_colors ) );
 	}
 
-	$current_color = get_user_option( 'admin_color' );
+	$user_id = ( isset( $_GET['user_id'] ) ) ? (int) $_GET['user_id'] : get_current_user_id();
+	$current_color = get_user_option( 'admin_color', $user_id );
 
 	if ( empty( $current_color ) || ! isset( $_wp_admin_css_colors[ $current_color ] ) ) {
 		$current_color = 'fresh';