Sand dollars♡ I used a 12x16 shadow box Printed a picture I had of the ocean regular paper size turned it sideways. A postcard of the legend of the sand dollar. Hot glue gunned about 24 sand dollars. You may want to get as much sand out as possible.
If you ever want to write on sand dollars, here's what you do: Two coats of Pledge Floor Care Finish (with Future Shine) -- apply with a cotton swab -- wait at least 20 minutes to dry and use a Sharpie paint pen to write. The protective wax coating (a) makes it easier to write (no longer a chalky surface), (b) saves the paint pen from drying up faster and (c) prevents the paint pen from bleeding (as it would on the original porous surface).