1. Add a bit of black. Unfortunately, the big shiny black box that is the flat screen TV just dominates a room. In more traditionally decorated rooms, and when white trim is involved, one solution is to have other black accents and accessories. Here the TV is over a dark stone fireplace; along with the darker brown floors, it helps ground the room. These elements and the black accents in the pillows and side table help to bounce your eye around the room and balance the black hole of the tv.
Tip: Even though there's symmetry with the two yellow chairs and the two urns on the mantle, the asymmetry of tall shelving on the left and the lower cabinet on the right help to fill the room with texture and interest. This helps to diminish the TV as a focal point.