Bottle caps are one thing that you will always see at a beach.
I hoping with this idea a lot of people would want to keep their bottle caps then throwing them on the ground. Please keep our beaches clean!
All you need is Bottle caps, paper, glue and clear nail polish. Cut a circle out of paper and glue it right into the bottom of the bottle cap.
Do not brush the nail polish on the paper, just pour a couple of drops onto it. It will take a hour to dry.
To hang it, you would need to drill a hole in the one side of it.
You can always glue a magnet on the back or even glue a pin backing to it.