Add color to brighten your rooms. Brush on a fresh coat of warm, neutral-color paint in each room. Ask your real estate agent for help choosing the right shade. Then accessorize. Adding a vibrant afghan, throw, or accent pillows for the couch will jazz up a muted living room, as will a healthy plant or a bright vase on your mantle. High-wattage bulbs in your light fixtures will also brighten up rooms and basements.