Not only does God throw dice, but Einstein does too, or at least a stencil of him on a wall in the Upper Haight in San Francisco does. This post suggests that it may have been by the graffiti artist Banksy. It's been painted over.
More pictures here and here.
It's been painted over, apparently. That's probably for the best, because that means I won't try to find it when I move to the Bay Area.
(Oh, yeah, I'm moving! I got a job at Berkeley.)