Mine

$ret = GalleryEmbed::init(array('fullInit' => 'true'));list($ret, $albumIds) = GalleryCoreApi::fetchAllItemIds('GalleryAlbumItem');list($ret, $albums) = GalleryCoreApi::loadEntitiesById($albumIds);foreach ($albums as $album) {  $album->setTheme(null);  $album->save();}$ret = GalleryCoreApi::setPluginParameter('module', 'core', 'default.theme', $g2Theme);$ret = GalleryEmbed::done();