I never would have thought of this !! Using a knife magnet to hold odds and ends.
The best place for messages is also ideal for keys. Attach a magnetic knife holder,available at kitchen supply stores, along the bottom of an entryway bulletin board to keep important items..keys,scissors, even an emergency flashlight-within reach. Secure the magnetic strip with its accompanying hardware to the frame of the board.
I think this would work best in a rear entrance or a mud room .