Fabric Covered Thumb Tacks
Following the package directions, use the "pusher" tool that came in the pack to cover your buttons with fabric. This step is easy and the most fun! Then use a generous amount of hot glue to attach a tack to the back of your button. A standard tack should fit perfectly. Your cork board will thank you.
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Fabric Covered Magnets
For the magnet version, you'd obviously glue on a magnet instead of a thumbtack. I know that seems readily apparent, but if I don't state it for the record, I am guaranteed to get emails asking about it.
I had some 1/2" magnets I got at Walmart a long time ago, and used 3/4" buttons to glue to them. You can get buttons to cover at your local fabric store, or order some right here. They're so satisfying to make that one of the girls sighed wistfully, "I wish I could make these all night long."