Got a new iPad with a gorgeous retina display and want to make that background sing like Pavarotti? Check out these gorgeous retina-friendly iPad backgrounds over at Beautiful Pixels. These are some of the prettiest I have seen yet. I have copied a couple of them below, but you really need to head over their and click the links they provide for full range.
Bjango by Marc Edwards
Lucas Schvindt
Michael Toye
Advocate's Studio 