Sirron Norris has done some really cool murals in San Francisco and has also got some great t-shirts. This one of Lombard Street, the famously crooked street, is very cool.
He has a store set up on U2design.com, which actually has a store location if you want to check out the shirts in the flesh, so to speak.
I particularly like the Victorion:
Even better when you can see the actual mural
This mural is located in Balmy Alley in San Francisco’s Mission District.