Alternative to couches-two twin beds that can swivel. Would love this in a game room. Great for sleepovers young and old DIY tutorial includes super easy design for headboard/back of couch! + 27 Ways To Rethink Your Bed
DIY Storage bench - great idea if you have a kitchen under first window. Add cushion, use bench as seating. Put bench against wall, push table against wall, great storage for occasionally used kitchen things.