@sweetadobe Like Denita said, white dove definitely give you a crisp look. For me I will suggest you use it on ceiling or trim rather than for 3 matching wall. Using for matching wall will make your room look bulk bright and plain.... only if you are doing your room with a lot of moldings, details, build-in cabinets. I would recommend all white on wall. I am not familiar using white sand, but that looks nice from me:) Any gray, beige blue hint color will go great with nimbus gray. (I like stonlinton gray/ Coventry gray / Metropolitan af-690 ) Those are very safe colors. From my preference I will AVOID GREEN. Another way to do your matching wall is to use 25% formula on nimbus gray. that is the safest color to play. Just go to the paint store and tell them you want it lighten to 25%.