Some here http://users.skynet.be/J.Beever/pave.htm

http://www.impactlab.com/2006/03/09/amazing-3d-sidewalk-art-photos/ and more here!

The photo is a work is a work by Kurt Wenner named "Dies Irae". Kurt Wenner is an artist who originally worked for NASA as an advanced scientific space illustrator. He became very taken by the abilities of artists from the Renaissance, and he left NASA and moved to Rome to explore the works of the great masters. He now works in a variety of forms, and even designs houses, but one art form he has become famous for is street painting. This tradition is supposed to have started in Italy in the 16th century, where artists would use chalk and pastel to create images on the ground. They were originally known as Madonnari, since many of their images were of the Madonna. Passers by would throw coins, which is how the artists would make their living. Kurt Wenner has combined traditional street painting techniques together with his interest in classical art, to create an art form all his own. Many of the images use anamorphic techniques as well as trompe l'oeil, in order to create a world where fantasy and reality combine. You can see more of his work at http://www.kurtwenner.com.