There are two street/pavement artists who I think are amazing. I've only just found out about this guy, Edgar Mueller. The images below are © Edgar Mueller and his website is http://www.metanamorph.com/
Here are a couple of his shots.
The first time I came across street/pavement art was when I saw some scenes done by an English artist, Julian Beever. The following images are ©Julian Beever and his website is HERE
I hope you enjoy them :D