The Broth, The Global Mosaic is an amazing collaborative art project created by Cherry Internet Services located in Perth, Australia. The workspace consists of 1,000 tiles that any visitor to the site can move to create an image. I've gone to the site a handful of times, and there are always others around to play with. Some of the examples in the gallery are unbelievably stunning and creative. Registered users can chat with others on the site as well as take snap shots of their work.