Playhouses aren't just for the great outdoors. This simple structure makes an otherwise standard room a fantastic indoor playroom. Instead of an entire structure, you can create this by building out 2 walls and a roof. Because it's open, you don't get the sense that there is a huge thing sitting in the middle of the room. This playhouse (by DJS Interiors in New Jersey) has been made into a place to draw but you can make it a special place for anything. If you have kids, you know how they enjoy a cozy hideout, indoors or out.