Allow more light to enter the living room by using light curtains. Instead of using heavy looking "valances" use easy and if possible semi transparent curtains that are sufficient to reduce glare that might be caused because of sunshine. Use brighter color schemes commonly known as "hot" color schemes. These create a very good transmission and reflection of natural as well as artificial light inside the living room. There is certainly one more different approach to defining the perception of the living room (or any interior space) and that's the empty volume left out after all the furniture and also other accessories have been fitted. Because anything in our living world is definitely "relative". The perceived volume is always relative to the empty volume that is normally used for circulation. The more empty volume you get, the bigger the room will look.