I subscribe to a daily beading email. Sometimes they have free patterns for bead related items. On Friday, they send out a link to instructions on making beaded buttons. Go to http://www.beadingdaily.com/freeprojects/beadmaking/Beaded_Embellished_Buttons_471-1.html to download a PDF that shows three methods. In the bar above the page this link takes you to, there is a link to the Free Project Library.
I haven't tried any of them, but if you have, I'd love to hear about it. COMMENT BELOW!