I think some people call them ankle bracelets but aren't those the things you wear when the cops want to keep track of you? I don't know how to make those, but you'll find some pretty good information on making anklets here.
Learn how to make a beaded anklet using simple jewelry making methods. With images, video, supply list. This video isn't very clear visually, but the audio description is excellent so you shouldn't have trouble getting the gist of the technique.