This is a webcomic project Ginny and I started years ago. We took all of our characters, mashed them together into a house, and had fun with them. I built the world, she did the art and lent dialog help.
The project sat fallow for many years even before we split up; I think I was more passionate about it than she was. There was always this air that our character belonged in their original universes, not this shared one.
The only problem with that is, the chances of all of these projects ever coming to fruition are slim to none. So why not let them live in a form where they all can live, instead of maybe one or two who end up in successful projects?