Here's a few themes for you Android phone users....
http://www.droidforums.net/gallery/car-wallpapers/p4341-performance-cars.html
http://www.droidforums.net/gallery/car-wallpapers/p4192-misc-cars.html
http://www.droidforums.net/gallery/car-wallpapers/p3312-dodge-logo.html...