This moody monochrome living room with white walls, grey sofa and dark rug is gorgeous. A well thought out and well placed rug can really complete a space, transforming it from cold to warm, from mis-matched to coherent and harmonious.
Black, gray and texture, shine. Try smoky mirrored or reflective furniture (or a mirror on the wall); a soft, low-pile rug; and a plush faux-fur throw. Shades of gray, black and white make easy partners for a brown leather sofa.
Safavieh Porcello Modern Floral Grey/ Dark Grey Rug (6'7 Round)