Area rugs can play an important role in changing an entire room. An area rug placed on a diagonal in a room can give the illusion of spaciosness. In a large room grouping furniture around an area rug helps "ground" your furniture, and define a specific space. Place an area rug under your dining room table to add warmth to your space, but be sure to place a large enough rug so your chairs slide in and out on the rug without going off. About two additional feet on all sides should be suffi...