Most spas choose colors such as warm neutrals around which they'll base their decor. Why? These colors are very restful. Browns are very earthy and make us feel safe while whites are clean, fresh and pure. If earthy isn't your thing, stick with soothing pastels in your spa bathroom. Using primary colors- which can be beautifully vibrant - is much more energizing. Though exciting, this isn't the effect you want in a calming retreat.
Tips & Ideas
In bathrooms, especially where you apply your makeup, use colors that complement your skin - flattering yellow-pink-blue undertones. Hold a paint chip next to your face to choose a color that best suits you.
When painting with different colors, choose similar tones. This will enhance the harmony in the space, whereas too-different colors can have an incoherent - and hence unsettling - effect.
If you'd like to break away from traditional blue, use a wonderfully calm and relaxing green. Not only is it emotionally balancing, but its elements also connect us to nature.
While red is certainly a hot color, there's a reason you won't see it in spas. Red is the color with the longest wavelength and shortest frequency, so it is very intense and stimulating rather than relaxing. Don't do it.