Dont know about THEME.. but here are some cool wallpapers of the Caliber SRT4;
http://www.dodge.com/caliber/gallery/wallpapers/1280/wall_12_1280x1024.jpg
http://www.dodge.com/caliber/gallery/wallpapers/1280/wall_11_1280x1024.jpg
http://www.dodge.com/caliber/gallery/wallpapers/1280/wall_13_1280x1024.jpg
http://www.dodge.com/caliber/gallery/wallpapers/1280/wall_12_1280x1024.jpg
http://www.dodge.com/caliber/gallery/wallpapers/1280/wall_11_1280x1024.jpg
http://www.dodge.com/caliber/gallery/wallpapers/1280/wall_13_1280x1024.jpg