I also teach them to knit or crochet, so they have a sense of what it's like to work with your hands, to be able to have some creative control over the process, to work with friends or family and be able to talk while you labor, the calming nature of handwork, etc. and so on. It's a fun, if chaotic, class, and inevitably, we get one or two newly-obsessed knitters and/or crocheters out of it. (Almost anyone can learn the basics of crochet (enough to make a scarf) in an hour; basic knitting usually take a little longer, although some take to it almost as fast.)
This is the group that lingered after class was over, not wanting to put down their knitting. :-)
Wonderful!
I offer my geometry students an opportunity to do a crocheting project. David Henderson, or one of his students, realized that it is possible to crochet a model of a hyperbolic plane.