Organizing the whole thing would be hard, difficult, challenging, not easy (and other words that imply some high level of difficulty).
I've seen something like this in the pixel art section. Where some guy would start off a sprite with a line or something and the each successive spriter would add to it something. It was really interesting to see how some of the sprites came out. Not sure if that anecdote was relevant at all, but it's supposed to be a hint. :D