See Seashells Looking for the perfect way to show off treasures from your coastal travels? Copy and enlarge a map of the area you visited. Cut it to fit inside a shadow box, and use spray-mount to affix it to the back of the box. Fill the box with sand and shells you collected. You'll be transported to paradise every time you see it. DIY Tip: Make sure sand won't spill from the seams of the shadow box. If necessary, run a thin bead of wood glue along the seams to make it leakproof.