Use light colors and clever contrasts
It is a generally known fact that light colors make a room look bigger and brighter. Light and bright walls are more reflective, making a space feel open and airy, which helps maximize the effect created by natural light. Dark colors, on the other hand, tend to absorb light, making a room look smaller.
For an optimum effect, select soft tones of off-white, blue and green, and always remember that brighter rooms look bigger and more inviting. Try painting your wall trim and moldings in a lighter color than your walls. By doing so, the walls will appear farther back, making your living room seem bigger.