Fusion Frames [What about other ''rule-breaking'' shapes? Letters, breaking the wall so completely that it can't frame anything, sections of frame that go off on dead-ends, distortions partly alon (Cool Crafts To Make)
Otherwise, you're absolutely free to decide on a shape that is suitable for snugly in your living room space. Nobody will even know that you're employing the room divider to hide clutter. Somebody does not require a spare room to turn it into a playroom.