OMG so I just saw this on tumblr:
http://iguanamouth.tumblr.com/post/131267509722/kaijubrains-dimetrodone-psshaw

And I think it would be super fun to host something like this. Who's up for it??

You don't even have to be a particularly good artist to participate! Or even a digital artist! ahhhhh

So I think what would happen is I'd start it off with one drawing, which I wouldn't post publicly until all of them are done. Then I'd note that picture to the next person, then they note their version to the next, and so on until the end of the line.

I'm posting this on FA too so you might be collaborating cross-site with someone.