Key storage- door at the end of a kitchen cabinet for small storage. This gave me the idea that the inside of a cabinet door should be painted with chaulkboard paint so you can keep notes or grocery list there.
Paint center of cabinet door with chalkboard paint and use as message center, quote of the week, grocery list, family goals etc. Have a "frame" painted on my laundry room door for this same purpose. Like the kitchen cabinet idea too.