Totally agree with the whole age thing. I am slowly making all my characters older, like Sheri is now 33. At least in the RP I have her in right now lol.
For school RP I would LOVE to be able to do something like taking one school and forcing them to intergrate with another school. But the catch is one school is more "upper class" types of kids and the other is more "lower class" types of kids.
There was a fantasy RP a friend and I did, it's the "Past & Future Collide" RP I linked, where someone from a previous era is transported into the future some how and they have to try and learn how to get about in the modern world.