Some of the iPhone cases out there are truly beautiful. Zazzle posted today some of their bestsellers, and I took a look at them. They are impressive. They also gave me some ideas as far as creating iPhone cases myself, and showing you how easy it is to become a designer on Z., or at least to make your own products there (you can also create mugs, for instance) using your own images.
For instance: It only takes a photo of a gemstone or mineral to achieve a beautiful pattern. And yet not a lot of people create designs this way. If you collect gems or like to visit shows at a geology museum, you can take photos there and then come back to Z. to make your favorite iPhone case using those photos. In fact, I plan to create some designs for iPhones myself once the Geology Museum here in Bucharest welcomes another fair of huge crystals, semiprecious stones, and gemstone jewelry.
Then you can also use fractal software or images of works of art that are in the public domain.