Seashells are hard, protective layers that are created by different types of animals living in the sea. In addition to being the home to these animals during their lives, retired seashells have a variety of uses on land. Crushed seashells are fun fodder for crafts such as decorating a picture frames or boxes, crushed shells also can fill bottles or cups to become nautical shakers, or decorate the tips of acrylic nails. In addition, crushed seashells have many practical purposes, such as becoming mulch for a garden or as paving material to aid storm water runoff.
Purchase seashells from a craft store or online vendor such as Seashell World.
Lay a large towel on a table or another flat surface. Spread the seashells onto the towel. Leave three inch between the seashells and the edge of the towel. Lay another towel over the top of the shells and fold the edges together.
Roll the rolling pin over the shells inside the towels until all of the shells are crushed. The slow movement of the rolling pin should ensure that the seashells are crushed evenly.
Peak under the towel to check on the size of the shells. If they are not crushed to the desired size, roll the rolling pin over the length of the towel again.
Remove the top towel and roll up the second towel carefully in order to pour the crushed shells into a bucket or another container.
Wear shoes with thick heels, such as wooden clogs, to crush the shells in a towel on the ground or in a paper bag with your feet; for very thick shells, use a hammer. Turn crushed seashells into powder by placing the crushed shells into a plastic bag and hammering them.