What's the strangest medium you've ever used in your crochet/knitting?
My absolute favorite crocheted project is a vase I made out of drapery cord. The cord is about half an inch thick and very soft. I gave the vase to a really good friend of mine, but now I wish I'd kept it.
I've also crocheted with hemp, which is quite rough on the fingers.
How about you? What strange medium (other than yarn, thread, string, or twine) have you knitted or crocheted into a project?