If you have an iPhone, there is a free app by Team Associated you might want to check out. The Team Associated RC Wallpaper iPhone App is a great way to get some cool RC wallpapers on your iPhone.
The app includes wallpapers for justt about every Team Associated car, truck, and buggy. It also has a collection of Team Associated Logos that you can use as wallpaper.
The app is free so you might as well check it out. To download the app, open up the App Store on your iPhone and search for "Team Associated RC Wallpaper".