Choose from darker colors for the walls in a larger room. In a large room with soaring ceilings and large windows, a rich, deep color like red will make a warm and intimate setting. Other dark color choices include dark green for an earthy color scheme and navy for a more serious, adult color scheme. You can consider dark brown as well, but too much brown in the room might start to become dull over time.
Choose from light colors for the walls in a smaller room or in a room that doesn't have much access to daylight. Color choices in this category might include gold, sage green or gray blue. Avoid predictable colors like cream or white, lest they become boring.
Purchase samples of your favorite color choices. Paint the samples on the wall over the couch in large squares, side by side, so you can compare them.
View the paint samples at different times of the day and night, in all different qualities of light, to decide which color is best for you.