Bottle caps (you can buy these in bulk for pretty cheap, look online)
SUPER strong magnets
Something to put the washer on for your necklace (I found this big bag of nylon loops at hobby lobby for a couple of bucks)
Whatever picture or design you choose to put in the bottle cap
Once you have them cut out and fit to size use craft glue to adhere the paper to the bottle cap.
It doesn't take much to cover the paper. It comes out cloudy and dries clear. If you do get a bubble in there...good luck getting it out! One thing that occasionally worked for me was to use a straight pin to try and pop it or use it to scoot the bubble to the side and slide it out of the bottle cap.
Okay, here is where your SUPER strong magnets come in. You have to make sure they are really strong or they will get bumped off the necklace. Use your favorite type of super glue to attach the magnent to the back of the bottle cap.
Hook your washer onto your necklace.
Once you have a nice little collection you can make a cute magnent frame to hold all your bottle caps til they are ready to be worn.
I love it Jodi, thanks again for sharing!