This popped up the other day on my Facebook, so I went to see it. It is supposedly by a graffiti artist known as Muck Rock. I don't know anything about her, but dispite what you may feel about the impending change to paper money, this is pretty cool work. Perhaps I can get her to do a really large braided hair cent on my neighbors wall so that I can see it when I get up in the morning. I'm pretty sure he'd be alright with it, so no need to ask his permission.
I've got a couple of friends that are urban artists - it's amazing stuff, considering the medium and the size of the works!
I've got a better idea. Why don't you ask her to paint a portrait of a 1933 G$20 St. Gaudens on the steps of the Supreme Court in DC. Chris