MusicSkins has long had a large library of licensed artwork from bands, artists, and the like, as well as the ability to create personalized stickers. It has brought all of this to the iPad 2 with its newest Skins ($20). These ship with only one sticker for the back of the tablet -- unlike offerings from GelaSkins which also offer a bezel cover -- and this time, also not including screen protector films. On the flip side, the price is $10 lower than…