A former shed turned mudroom offers one mode of entry to designer Ashley Sharpe’s Bronxville home. Sharpe reappointed the space with upper windows and custom storage—painted Benjamin Moore’s Essex Green—including cubbies, a bench and drawers for her dog Chief’s food. Pebble tiling by Ann Sacks composes the floor. Thibaut’s Best Friend paper lends a playful flourish to the walls.