I am planning to redress my master bedroom. The floors w/b a mid tone hardwood with a large gray/white area rug. Bedding w/b is a tone on tone gray/taupe on white ground. It has been suggested to paint three walls with BM Indian River gray and one wall BM Classic Gray. The room has one double window on one wall and a second single window on another. I don't know if I could handle such a dark color on the suggested three walls. Would it be wrong to just do the wall behind the bed with the darker color leaving the other three walls in the classic gray?