Cushions, throws, books, art - all these objects are used to build a room. They stop it from looking bland and sterile, give the room depth and provide that much needed cosy feel. Perhaps the most essential part of this layering in any interior is a rug. Rugs, however, can be quite hard to get right.  Too small and it looks silly and out of place. Too large then you'll most likely be catching the door on it, while most of it will be crumpled up under furniture than on show.