Right now the tv is such a focal point not only because of its size but because it is on a light background. I would suggest either painting the wall a deep grey like the wall the sliders are on or even better get a beautiful charcoal and black wallpaper like something in the picture below. The dark wallpaper helps to make the tv blend in with the wall. Also you could get dark cabinetry to house any components you may need below the tv.

Mark is spot on. I would install a "floating" a/v cabinet on the wall below, also dark. I would consider mounting the monitor higher on the wall, too, depending on where you plan to put the furnishings relative to the TV wall. The center should be 66"high or so, if you are sitting 12' away. Happy Houzzing.