Found a picture of some of the graffiti at Gino's East. The writings cover everything except the bathroom walls where there are signs saying it is a graffiti-free zone - yeah, that works. In fact, outside of the bathroom (which is where I hope you spend most of your time during your visit) it is almost impossible to find a place to add your wisdom. But if anyone can get in there and prominently write "polarshark.com," send me a picture and I'll do something nice for you.
All in all, the trip to Chicago was a success.