Start with Slate Blue on the walls. It is that grounded, slightly gray blue that makes a dining room feel calm and a little dressed up, the kind of color you want around a long dinner. Because it is cool and quiet, it lets candles, glassware, and good food be the bright things in the room. In daylight it leans soft and airy; at night it deepens into something moody and intimate.
To keep it fresh, wrap the trim and millwork in Bright White so the blue has a crisp, clean edge and the whole room stays light. Then bring in Natural Oak as your accent, through the table, chairs, or a sideboard. Its warm honey tone takes the chill off the blue and ties everything together. So: slate blue on the walls, bright white on the trim and ceiling, and warm oak wood doing the work as your accent.