A wide arch makes way to a candy-colored oasis in this funky home. The underside of the arch is painted pink to match the walls further inside, while the front surfaces are painted blue to match the walls behind it. This creates a more seamless transition to each room rather than an abrupt color change. A general rule of thumb is that if the rooms connected by an arch are two different colors, you should paint the underside a lighter tone to keep the space feeling more open.