Dark wood on a pale wall is the classic reason to pick mahogany. This is our thin shelf with rounded front corners in exactly that role: a slim, dark line that holds a plant or a few photos without dominating the room.
It runs 6 to 36 inches long and 3 to 8 deep, a narrow floating shelf on hidden brackets, cut from a single solid board.
Walnut stain is the darker option. Oak and maple run lighter, and poplar comes unfinished for painting.
Hang it beside a mirror or over a desk. It is a shelf that works in pairs.