We like the idea of a display cabinet that also conceals, and this one, from LA-based design team Speke-Klein, accomplishes both missions with elegance.
When this small wall-mounted mirrored cabinet is closed, it's a frame for a favorite object or image. When the mirrored door is opened, a pinwheel of internal shelves are revealed. Plenty of room for other small treasures... or messes. Even better if the display objects in some way clues you to what's inside the cabinet.