what would the room look like? I think I'd start with paint. I'm not actually sure if they allow you to paint, but I think there is no better time to ask forgiveness rather than permission. I would be hard pressed to pick one color and stick with it so I'd probably want to repaint about once a week, but I think I'd stick with bright colors.
You can never have too many happy colors in one room. Courtesy of House of Turquoise.