In between business travel, London travel disruption, lost purse and travel card and coordinating elder son getting off to a trip to France, I've been stitching up some examples. I'll use these to demonstrate the mounting technique in to the button.
Beaded on hand-dyed velvet, about 29mm in diameter
Beaded and stitched on indigo - shibori cotton
Detail of beading, again about 29mm in diameter
Detail of "buttoned" button
and if you've ever wondered why you sometimes have difficulty threading a needle, could this be why? Image from here.