DIY Shadow Box from a Picture Frame - Scout Leader challenge - build a shadow box. The boys that built one received antique barbed wire to display in it. A simple tutorial on how to build from an old picture frame.
Toilet Paper Shelf - Just buy a "shadow box" from a craft store and paint! (I probably wouldn't use this idea specifically for a toilet paper shelf, but worth remembering for other places around the house)
Anniversary Present For My in-laws 30th. Where he asked her, where they said I do, and where they live now. Bought shadow box picture frames from Marshall's for $7 and used scrapbook paper to trace a heart for the maps I printed off google. And more scrapbook paper for the pinwheels:-)
What to do with your seashells and sand you save from vacations: Buy a shadow box frame and pick a picture from vacation that you took next to the ocean. Place the sand from that beach in the shadow box, add your seashells, sand dollars, starfish, etc.