Here’s a necklace I made a while ago (August 2002 I think) out of snail shells I found while on vacation in Maine.
This is meant to be a tight (“choker”) necklace. The shells only go about 2/3 of the way around the neck, with the elastic cord making up the difference.
The design is fairly simple; I just cut holes in the shells and worked the cord through. I think it looks nice.