On Fire - Take a fire truck theme one step further with a firehouse headboard. A wall mural is a great way to top a bed and add to a room's theme. Here, the fire truck bed is pushed against the wall and the brick firehouse mural surrounds it.
Great idea RE the twin mattresses. I also love the tree pictures on the wall! Love to display kid-made art in a kids room! Two twin mattresses, some plywood, and a great playroom that doubles as a guest room or sleepover room.