I blogged earlier about my Yellowcake Uranium piece, for which I couched curls of yellow yarn. I've actually made two of these and sent the second one to Sanderson as it is on the same kind of stretcher as the Asbestos, and I wanted them to be matching. If you can't get to Sanderson's exhibition or miss out (I hear work sells quick at these shows) I might let you have the other Yellowcake which I actually think is prettier (its the one featured in this blog post)
I also made a piece of Blue Asbestos. The Asbestos also uses the couching technique but this time with bundles white cotton crochet thread. Yes, I know its not blue, but I used as my model a photo of a kind of asbestos called fibrous tremolite which is in the amphibole blue category of asbestos.