
kat them pics are great i tried to recreate a smilar one for my art piece at school i had to do it on what was like an upturned carpet as the school didnt seem to like the idea of me spraying there wallsI love bit different, something that takes more than just skill but a sort of greater understanding, Jullian Beever is AMAZING with his 3D street art, google him but if you're too lazy the link below is a personal fave...
http://www.grand-illusions.com/images/articles/opticalillusions/beever/mainimage.jpg