Shadow boxes can look so cool if they are done right.and that is the problem, trying to do them right. Here are some ideas on cool ways to make shadow boxes come back into style like those high waisted shorts from our mothers era.
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.
Put a picture of the beach you visited in a shadow box frame and fill the bottom with sand from that beach. Much neater than a random jar of sand and shells! decorate the frame or put seashells or treasures found on the beach in the shadow box