My Collab Idea (for after MC is over, presumably)

Earth is polluted, almost to the point of an apocalypse, so Professor So-and-so decides to try an experiment to move the pollution to an empty dimension. The most powerful shunter in centuries. s/he arranges a demonstration to hopefully save the planet, but it goes awry (possibly through sabotage?), sending random audience members (aka the contributors) traveling from dimension to dimension, and no one knows how to stop it (until the collab is over)

Then, everyone could take turns coming up with a dimension. Like, anything. One person would set the stage and specify anything important they wanted to have in their dimension and then anyone else who wanted to try would have a turn and then we'd all be automatically shunted to another dimension. If the characters split up, they wouldn't necessarily appear in the same place in the next dimension, so different people can write at once (after the first person has invented the dimension) and if anyone was touching someone when everyone was shunted again, they'd join. And anyone who dies dies.

There can be anything in a dimension, alternate endings with SP characters, (Like Tanith with no remnant! :D or Sanguine being from somewhere other than Texas. That'd be weird, but the whole point of this would be a fun experiment-y thing, so weird is okay)

And that's my idea as it currently exists--subject to changes depending on what people want to do.

And if no one wants to do this, I might write it myself, because it sounds like fun, to me anyway. :-)