Most people choose a rug based on its appearance, but ultimately you want rugs to enhance or at least complement an interior space. With that said, it's interesting that the size of the rug, not just its appearance, can change the dynamic of a room. Keep at least 18 inches of bare floor exposed by the rug's edges. Selecting a rug for the living room usually comes down to three choices: 5x8, 8x10, or 9x12. Some size guides recommend that either all the furniture rests on the rug, or all the furniture, except for the coffee table, is placed completely off the rug.