Oh, yes! http://www.hometalk.com/168209/just-a-few-crafts-i-did-with-shell-seas
Here are a couple more ideas:
Buy a vine wreath at your local craft store and make a seasonal wreath for your front door or fireplace. You can add to for any holiday but tucking in that holiday symbol.
You can fill an apotheraghy jar, a bowl , so many ideas. Good luck
Find an old picture frame that you can paint up and make a shell mosaic design. Cut mirror is inexpensive and you have a mirror full of beach memories!
I personally have used them to decorate flower pots and picture frames. There are masses of ideas on this board: http://www.hometalk.com/b/1242402/shell-projects
SEASHELLS make very nice mobiles and also photo frame inserts