Banksy Graffiti Artist
This guy does really cool graffiti in London. His site is here . He does subversive or commentary ones: Article about " One nation under CCTV " artwork/stunt. 4 photos of his efforts, made into a postcard. He does cute ones, generally with rats: He does beautiful ones: (Some categories may overlap) *All photos from http://www.banksy.co.uk , where there are many more. I like graffiti.