A powder room is the one space where you can be brave, because you are only in it for a minute. That is exactly why Naval Navy works so well here — a deep, saturated blue on the walls turns a tiny room into a little jewel box instead of an afterthought.
To keep it from feeling like a cave, I lift the ceiling and trim with a soft Cloud Greige and bring in Soft White on the vanity. Those two lighter tones give your eye somewhere to rest and make the navy feel intentional rather than heavy.
The warmth is what makes it cozy and current. A Warm Walnut floor or floating shelf adds a natural, lived-in note, and a touch of Smoky Teal — on a framed mirror or a painted door — ties the blues together. Lead with the navy, keep the whites doing the quiet work, and let the walnut and teal be the small, special details.