As always, color is the easiest thing to play with. Blues and greens, though predictable, are often the most tranquil-feeling, spa-like colors. If another color is more soothing to you, though, by all means go for it.
Another easy way to add a calm element is with a duvet, which is used far more frequently in Europe. To get a new look in your bedroom, you don't need to get a whole new comforter set, just switch out your duvet. Look for one that's double sided, and you'll have even more options: When your mood changes, just flip the comforter!
Find our how to upholster a headboard.
Nestpert: Jennifer Bertrand, season three Design Star winner.