gallery3-contrib/3.0/modules/exif_gps/css/exif_gps_menu.css

#g-view-menu #g-exif-gps-album-link {
  background-image: url('../images/ico-view-exif_gps_album.png');
}
#g-view-menu #g-exif-gps-user-link {
  background-image: url('../images/ico-view-exif_gps_user.png');
}