Painting built-ins a beachy shade that's different from the wall color makes them—and their contents—pop. Sandy taupe is a versatile choice, while an inky blue makes a bold statment. If you don't want to commit to a color for the whole shelf, warm turquoise on just the backs showcases your items beautifully.
From top to bottom:
Light Stone (9); farrow-ball.com for retailers
Pacific (23-30); prattandlambert.com for retailers
Summer Nights (777); benjaminmoore.com