Painting Trim Darker Than Walls . Painting trim darker than walls. It will make the room look beautiful. Painting the Guest Room Dark + My Paint Formula for Walls and Trim from www.chrislovesjulia.com Cut in no more than 1 from corner and 2 from ceiling line. If you want to create a contrasted look or bring focus to your windows or door frames, choosing a trim paint color that is darker than the walls of a room can be an ideal choice. Wall and trim color combinations.