To make them:
Wash and dry the caps, then spray paint them white. Let dry.
Download the clock graphics I made, print, and cut them out. Brush the surfaces of the bottle caps with a bit of Mod Podge or other glue, stick on the clock faces, and brush another coat of Podge over the top. Let dry.
Glue magnets to the back. I used E6000 glue for this, and the magnets are 1-inch disc magnets from a local hobby store. They weren't quite thick enough to fill the bottle cap, so I added a small piece of cardboard as "filler" to make the magnetic surface level with the edge of the cap. Done!
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