One of the best wall colors i've ever chosen was "Vanillin" by Sherwin Williams. It is a toned down light yellow, and it will look subdued and lighter or darker on each wall depending on the light coming in. The soft greys are popular now too. Start out with a light grey and have the man in the store add your favorite color to it.) e.g. You could add a soft green and adjust the "tone" to go with everything .