From q-bella.blogspot.com

This project is easy and you only need a couple of supplies...so basically it is the perfect project.
All you need is sand, a piece of card stock (size to be framed), cardboard, and a spray adhesive (I used 3M super 77).

Place the card stock on top of the cardboard, then lightly, and evenly spray on the adhesive. Now sprinkle the sand (before you use the sand make sure that there is no bits a debris...you want pure sand.) on top of the sprayed card stock.

Gently pick up the card stock and remove extra sand, and let dry, and then you will have your very own custom made sand paper to frame.

Here is a close up of the paper just, because I think it looks cool.

When the paper is all dry then it is ready to be framed. I framed my sand paper in a thick frame from Crate and Barrel. It was just thick enough to put the star fish inside. I think a shell would be equally stylish. Have fun and enjoy!

P.S. If any one can come up with a better title then let me know. I don't know how to describe this project with out using sand paper, but I feel it could be confusing. So, sorry for the confusing title, but I love this project, and wanted to share.