My Holiday Gift Partner is a huge Disney fan, so I made her a set of 10 Disney themed bottlecap magnets. These were pretty simple, other than getting the picture size just right to fit. It was a kit I ordered on Amazon. I used double sided tape to adhere the picture, then the kit had a sticker dome that you put inside the bottlecap. Then I glued the magnets to them.
As you can see, I tried to do a mixture of Christmas and vintage movies.