I'm not so much into iPhone cases for myself (seems sort of redundant - like a Car Bra) but I can't deny a great idea when I see it - such as these Bamboo iPhone Cases - laser engraved with art from a number of recognizable artists; Amy Ruppel, Nando Costa, Ryan Bubnis, etc.

The craziest part about the cases is that if you aren't into the Artist Series you can just put your own art on there; any (reasonable) image engraved right on to your own unique case. Check the Customer Examples for some great usage of this option.