Collective Sketching?

SwarmSketch is self-described as "collective sketching of the collective consciousness." 

Each week the site chooses a popular search term which becomes the sketch subject for the week.  Each user can contribute a small amount of line per visit, then they are given the opportunity to vote on the opacity of lines submitted by other users. By voting, users moderate the input of other users, judging the quality of each line. The darkness of each line is the average of all its previous votes.