This is great. Joe D!, as he is known on Flickr, decided it'd be neat to deface, I mean - artistically improve U.S. paper currency by adding some doodles. He managed to create an entire Flickr photo set dedicated to this hobby. Here are a few samples:
So far Joe D! has published 75 peices of his art work, which have received a total over over 500,000 views. He is as surprised as anyone about the attention they are getting.
"wow, i'm surprised how much everyone likes this. it's just something i've been toying around with every now and then, it all started when i would draw glasses or beards on money with the counterfeit pen on the registers at work and just grew in to a hobby."
I wonder if he takes requests? A Mr. T version of Lincoln might be a good place to start.
Source: Refacing Government Tender.