I live a 5 minute walk from the beach and have become obsessed with collecting shells and making things from them. At the moment I make fish. Carefully positioning shells then using a pva type glue, paste them onto my wooden cut out shape. I always try to find the perfect eye shell, preferably one with a barnacle. Anyway after it has dried I hot glue my rope around the edge. Finally I stick a piece of material ( normally denim) on the back. The finished result is a rustic fish.
The girls had a go using shapes of their preference. They had great fun finally using some of their shell and stone collection. We added a few plastic squidgy things to brighten up their patterns. And when dried I will hang on some wire or jute (I always drill a hole just in case it is needed) and will hang in their bedroom.