Green is the color of the outdoors. It's leafy, restful, stable and tranquil. Because it recedes, it's a great backdrop for large spaces, such as a living or family room. Green covers better than red, yellow, and orange do. Purple and violet have long been associated with richness, royalty and ceremony.
Purple works well in public spaces of the home.
Red is dynamic and signifies warmth. It also creates a cozy, cheerful room. It works well in dining rooms. Yellow is terrific teamed with white and blue. It is best used in small doses.