I think I may have found my new iPhone case!
I first found Society6 when someone posted a funny Batman print from them over on Google+. I decided to check to see if they had any Superman-motif products and boy do they! You can find some great art in the form of wall prints, clothing, devices (such as the Superman iPhone 5S case), books, stationery and even houseware items.
Go take a look, you might see something YOU like.