How can I decorate a thumb tack with buttons?
take any kind of flat button and a thumb tack, take a piece of two-sided tape and put it on the surface of the thumb tack, put the button on top of the glue and let it sit for a few minutes before using.
take any kind of flat button and a thumb tack, place a dab of glue on the surface of the thumb tack, put the button on top of the glue and let the glue dry before using on your bulletin board.