My boyfriend's kids share our guest room when they're here for visits. His daughter is 5 and his son is 4. We have red metal, twin-sized bunk beds and a white toddler bed. There is no central theme to the room at all. Toys are scattered about and I don't think it's a very stimulating area. I was wondering what sort of decorating tips people have for this sort of situation. Keep in mind that I can't paint because we're renting the house. Thoughts?