Light colors such as white and yellow are airy, expansive and cheerful. Use them in small, dark areas that you want to appear larger and brighter. Dark colors such as navy blue or brown can create a cozy, sophisticated feeling in oversized rooms. With the right painting techniques you can accentuate good architectural features and camouflage unattractive ones, on both the interior and exterior of your home. Attractive architectural features such as molding can be emphasized by painting them a darker or lighter color than the walls.
Color can establish a focal point or create interest where there is none.
For instance, a perfectly square room can be made more interesting by painting one wall in an accent color. Using the same color or a slightly different shade of the same color will have a unifying effect. A dark color paint on a high ceiling will make it seem lower. An exaggerated roof will be minimized with a dark color. Color can alter the proportions of a room.