Filling glass containers with all size shells was my first reaction. I've filled mason jars, honey jars, perfume bottles, and even petri dishes! Shell collecting has become an easy and economic way to decorate.
Shells Displayed in Petri Dishes
Another idea I had was to encase the shells in the petri dishes and seal them closed, then tie a ribbon around the outside and make Christmas ornaments but I found something else better for that.
Honey Jars Filled With Shells
A Garland of Shells Around a Gourd
I like the mixing of the shells with the wood looking gourd. Its nice to have different elements come together. This came about just to save space. I do lots of crafts and my craft/art cabinet doesn't always have room for larger supplies like large gourds.