i've had these buttons for ages and hadn't done anything with them, (you can find them at michael's or hobby lobby) so of course imagine my excitement when i saw this DIY at wild olive.
just follow the instructions for covering them with fabric (super easy)
cut a piece of fabric to fit the size of the button, wrap and snap on back using the device that comes in the packet.
i secured mine to my finger with a loop of elastic... voila! (oh and the picture below is of the 2nd one i made)... love