Firemint have released a set of Real Racing 2 wallpapers for the iPad and desktop.
There are 6 wallpapers, each with retina and standard versions for the iPad, and a desktop version. All you have to do to get them is visit the Real Racing Facebook page and give it a like.
I like the diagonal branding in the one at the bottom left of the set above. It looks nice on both the iPad home and lock screen.