There was an photo from Japan floating around a couple of weeks ago of a Gameboy style case for the iPhone.
I fired up photoshop and created a template that you can use to print out your own and put it in a clear iPhone case.
You'll need this template and a clear iphone case. I recommend the Agent18 Clear Case.
You can see the basic instructable right here.
PS - if you're looking for a Video Editor/Motion Graphics artist in the NY Captial Region,
drop me a line or check out my editorial or motion graphics reel.
Agent 18 Shield Case for iPhone 3G (Clear)