When you look at your bathroom what do you love about it? The color? The fixtures? The amenities? Do you have a soaker tub? A jetted tub? Clawfoot or no tub? If you could redesign it what would you add or remove? If you plan to relax in this sanctuary keep the colors simple and calm. Blues, creams and tans work well in achieving that feel.
Keep in mind, bright colors give a vibrant energy to the space. Though often used in children's bathrooms, perhaps calmer colors will help with the bedtime routine.