IKEA, for example, sells quite a few wall cabinets that are great for spaces of this size. The HAGAÅN open wall cabinet , GODMORGON one-door cabinet , and HAGAÅN open cabinet are all perfect picks.

IKEA's HAGAÅN is an open wall cabinet that's about the same size as a medicine cabinet. It's shallow, so it doesn't jut out and take up more space than it has to, at just 6 inches deep. The four ...