I had a few of these and I shared 'em in the c-box, so I might as well post them here:
The Greatest Game Ever Played: Essentially, Teen Titans vs. The HIVE in some sort of sports competition. I'm thinking either Baseball, Basketball, or Hockey. Baseball because it's sorta the standard sport for this sort of situation (and because it'd be like
This), Basketball because it'd be like Space Jam (and everything needs to be a little more like Space Jam) and Hockey because it can get violent, and violence is just great when added in with super powers.
It'd also work for the HIVE's whole 'school' thing. Schools have sports teams...why not the one for super villians? The only real questions are: 1. Is anything at stake in this game? 2. Who'd be playing (and what position?)
The Metamorphosis/Power Corrupts: Okay, remember that time Spider-Man grew two extra pairs of arms? This is basically the same idea; already super powered characters start mutating for some unknown reason. Their powers get stronger, but they start getting freaky looking. For example, Animal themed characters (EG: Spider-Girl, Cheshire, Queen Bee) start becoming more animal like (growing extra limbs, fur, etc). It's up to the characters to discover what it is that's making them change...and if they even want to stop it, since it's making them stronger.
We'd obviously need to decide who's changing and who isn't, how are they changing (power and appearance wise), and what's causing the change.
SO yeah, those are my ideas. Tell me what you think if you want to do them or not.