I have taken part in a group painting project that has been initiated by “Richard Robinson”. He took a John Singer Sargent  painting and divided it up into 80 equal slices (which conveniently were squares) and asked artists all over the world to sign up, to participate, and assigned them each, one of the slices/squares. I was lucky enough to sign up and become a part of this cool project. (Sign-up filled up within an hour). Below is the link to this project and you can see how the picture is coming together, as people are submitting their pieces (You will have to scroll down to the very bottom of the web-page). I did the “Slice 50” (right side), I am thinking of fixing it a little more and resubmitting… let’s see, if time permits.
http://thecompleteartist.ning.com/page/group-painting