GelaSkins is a company that manufacturers high-quality art decorations for portable devices such as laptops, phones, and portable game and music players. They have a stellar gallery of available skins to which I am honored to contribute my latest two works: Graffiti Skyline and Loose Leaf. I've been using their products for a while now and I can say with confidence that you won't be disappointed in the quality. They're removable too, so you don't have to worry about sticky residue being left behind if you want to switch to another one.
I'm really excited to be selling my designs through them. You can visit my profile page here which has all of my skins listed by device category. Be sure to check out their whole gallery, too. They have really incredible stuff and they make great gifts. If you're an artist and you think your work would look good as a skin, you should definitely submit some via their contact page.