I do chainmail during lectures to make sure I stay awake. But since it's annoying to try working on a big (loud and jingly) project during a 1-hour lecture, I make little bracelets and stuff. Here's a bunch of them in different colors of anodized aluminum and black rubber rings. The one on the right will be an anklet as soon as I get back to my dorm room and put a clasp on it. (Someone wanted one. It doesn't have rubber rings.) The weave for all of these is half-Persian 3-in-1.

Something like this would be $15 if you wanted one.