Well, I did have this one idea for a kind of Subspuf-powered Homestuck parody.
It would involve eight kids whose dialogue and personality would be directly acted out by eight subSPUFers, chosen by me. The rest of SubSPUF would post suggestions for actions for the characters to take, much like the early days of Homestuck and other MSPA stories. I would then coordinate with the eight "actors" to decide which actions to take, and to write out their characters' dialogue with each other.
I'd probably call it SPUFstuck or something like that.
Y'know, now that I see all of this written down it looks like a terrible idea. Just forget I said anything.