A friend gave me a set of vintage bottlecaps with magnets attached to the back some time ago. They are my favorite magnets. But I only had 5...so I decided to make some more. I sourced about 150 vintage bottlecaps from ebay, then hot glued magnets on the backs of all of them.
Finally, I attached sets of 6 to metal plates I found at Home Depot. They have become a perfect go-to gift for friends and family. I am also selling them on my etsy site, Trulaaluu.