Start with a bold rug: A design that uses two or three striking colors is like a road map pointing where to go next. The rug defines the space and color scheme, making it easier to choose accessories.
Try an umbrella: They're designer Judy Kameon's secret weapon. "Umbrellas are a lot less expensive than permanent structures, and they’re great for atmosphere," she says. "Take them down to view the stars; move them out if you’re having a party.”