Start with Soft Gray on the cabinets. It is the quiet anchor of this bathroom, a gentle, barely-there gray that feels fresh and clean without ever turning cold. Because it carries no strong undertone, it plays nicely with chrome, brass, or matte black hardware, and it keeps a small room feeling calm rather than busy. This is the color that sets the mood: spa-like, tidy, and easy to live with every single morning.
Wrap the walls in Bright White to open everything up and let the light bounce around. It is a soft, warm white, so it reads clean without the sterile, hospital edge that pure white can have. Then bring in Slate Blue as your accent, deep and moody, on a vanity, a single feature wall, or the door. A little goes a long way here. So: soft gray on the cabinets, bright white on the walls, and a touch of slate blue wherever you want a bit of depth.