mylittledemons on DeviantArthttp://creativecommons.org/licenses/by/3.0/https://www.deviantart.com/mylittledemons/art/Ubuntu-13-04-Raring-Ringtail-Wallpaper-336042031mylittledemons
I dont know whether you know this or not, but theres an ubuntu wallpaper contest for the default ubuntu wallpapers in the upcoming 13.04 [link] You shoud check it out