Painting Pallette?

So I am looking to give our main Sunday School room a face lift. It is bad need of a little modernizing and COLOR!!

This room is a large rectangle shape. Across one of the long walls is windows. The front wall is mostly whiteboard (soon to be projector screen). I really wanna add some pizazz to the room, but not frighten everyone either. We're talking about a church here, ya know? :)

If you could do anything, what colors would you put in a Sunday School Room? I really don't have any starting point, or direction of where I'm going. I am drawing a total blank.

HELP!!!!!