diff -Naur brilliant_gallery.orig/brilliant_gallery.module brilliant_gallery/brilliant_gallery.module
--- brilliant_gallery.orig/brilliant_gallery.module     2013-04-13 17:51:42.000000000 +0200
+++ brilliant_gallery/brilliant_gallery.module  2013-05-29 17:22:09.000000000 +0200
@@ -316,6 +316,7 @@
     '#title' => t('Overlay browser'),
     '#required' => FALSE,
     '#options' => array(
+      'colorbox' => t('Colorbox'),
       'lightbox' => t('Lightbox'),
       'thickbox' => t('Thickbox'),
       'greybox' => t('Greybox'),
diff -Naur brilliant_gallery.orig/gallery_manage.inc brilliant_gallery/gallery_manage.inc
--- brilliant_gallery.orig/gallery_manage.inc   2013-04-13 17:51:42.000000000 +0200
+++ brilliant_gallery/gallery_manage.inc        2013-05-29 17:23:54.000000000 +0200
@@ -134,6 +134,12 @@
 
           switch ($overbrowser) {
 
+            case 'colorbox':
+              $displayimage .= ' class="colorbox cboxElement"';
+              #$displayimage .= ' class="colorbox cboxElement"';
+              $displayimage .= ' rel="gallery-' . $setname . '"';
+              break;
+
             case 'thickbox':
               $displayimage .= ' class="thickbox"';
               $displayimage .= ' rel="img_' . $setname . '"';
diff -Naur brilliant_gallery.orig/gallery_showtime.inc brilliant_gallery/gallery_showtime.inc
--- brilliant_gallery.orig/gallery_showtime.inc 2013-04-13 17:51:42.000000000 +0200
+++ brilliant_gallery/gallery_showtime.inc      2013-05-29 17:24:16.000000000 +0200
@@ -501,6 +501,12 @@
         #}
 
         switch ($overbrowser) {
+          case 'colorbox':
+            $result .= ' rel="gallery-' . $setname . '"';
+            $result .= ' class="colorbox cboxElement"';
+            #$result .= ' class="colorbox init-colorbox-processed-processed cboxElement"';
+            break;
+
           case 'thickbox':
             $result .= ' class="thickbox"';
             $result .= ' rel="img_' . $setname . '"';
diff -Naur brilliant_gallery.orig/views.inc brilliant_gallery/views.inc
--- brilliant_gallery.orig/views.inc    2013-04-13 17:51:42.000000000 +0200
+++ brilliant_gallery/views.inc 2013-05-29 17:24:41.000000000 +0200
@@ -153,6 +153,13 @@
   $setname = mt_rand(1, 9999999);
   $overbrowser = variable_get('brilliant_gallery_overbrowser', 'thickbox');
   switch ($overbrowser) {
+    case 'colorbox':
+      $result .= ' class="colorbox cboxElement"';
+      $result .= ' rel="gallery-' . $setname . '"';
+      #$attributes['class'] = $link_class;
+      #$attributes['rel'] = 'img_' . ($node->nid? $node->nid: time()); // 'insert' has no $node->nid
+      break;
+
     case 'thickbox':
       $result .= ' class="thickbox"';
       $result .= ' rel="img_' . $setname . '"';