Posted a couple of years before the game's release, Ron Gilbert's Deathspank wallpapers are excellent, free and available in every resolution imaginable. Also, available in ascii and for EGA. Also, also, available for your iPhone.
Just ignore the odd post title and follow this excellent link to some of the best wallpapers ever created. They all are about the Atari Lynx of course, the first and best (well, almost) colour handheld console ever, and cover everything from the hardware itself to its classic games. Oh, yes, you'll also find some rather great Atari Jaguar desktop images too.