Here's an idea...keep the gray, white, and black as a constant base color palette. Change accent colors easily when the mood strikes without having to redo the entire room. I can see purple, green, teal, coral - all working well. Endless possibilities!
Bedrooms look great in white, and this colour is a very appropriate interior solution, especially if you are looking for a peaceful and relaxing atmosphere. On the other hand, the fashionable minimalist bedroom furnishing also can make you feel good.