To turn your home into a haven that exudes the sleek functionality of mid-century modern design, the best place to begin is with the walls. The goal is to brush on a color that makes the room feel calm and clean -- think crème, beige, taupe or off-white. But if a simple white wall is too vanilla for you, don't be afraid to paint an accent wall in lime, tangerine or chocolate. Color evokes optimism, which is why it was used in the '50s and '60s after two consecutive World Wars. It was a time of celebration.