Mass-produced cabinets take on custom character with a few easy additions. Here, four matching brackets -- two right-side up, two upside down -- expand the usefulness of a double-door cupboard. A narrow shelf tucked underneath is the perfect spot for spices. Below it, a dowel between the brackets holds towels. On top, a flat horizontal strip keeps platters in place. Once painted, the multipart cupboard looks like a single piece of cabinetwork.