Start with Misty Blue Gray on the walls. It is that easy, in-between shade that feels like a quiet morning — part soft blue, part gray, never loud. In a living room it does the best kind of work: it settles the whole space down so people actually relax. It plays well with daylight and lamplight alike, and it never fights the furniture, which makes it a forgiving choice if your sofa and rugs already have a story of their own.
Keep the trim and any built-ins in Clean White so the edges stay fresh and the blue gray has a clean frame to sit inside. Then bring in Walnut Brown as your accent — a wood coffee table, a picture frame, the legs of a chair — to ground everything with a little warmth. Walls in blue gray, trim in clean white, and brown saved for the wood and small touches: that simple split is what makes the room feel calm and put-together instead of cold.