Without seeing the rest of your furnishings and textiles, I'd pick from a coastal color palette, like this:

We have Wickham Gray in the public rooms of our home. It changes so much with the light, but is always soft and neutral. It looks like a light green/blue in the kitchen, breakfast and family rooms (light comes from east and north), but more of a light gray in the LR, DR and entry where the light is from the west and north. You could paint the bedroom the same color as the bathroom, with satin finish for bath and flat for the bedroom. They will look a little different, but will coordinate well.

IMO if this is a master bedroom the bathroom should be in the same color palette.