Though we generally don't post new First Looks for merely cosmetic updates to prior iPod or iPhone products, we're making an exception for MusicSkins' series of stickers based on The Beatles -- the first licensed Beatles accessories to be released for Apple's devices. Eight different designs are based on the band's famous album covers and logos, including the iconic Abbey Road, Let It Be, and Sgt. Pepper's Lonely Hearts Club Band images, and MusicSkins…