BTW, I saw the Shiva paint-sticks in use on a couple of Fons & Porter shows on TV & on YouTube videos by Nancy's notions, where she shows how to do highlights on landscape quilts. Ok, it turns out Nancy uses Neocolor "wax pastels" instead, but I've seen both used.
Check it out here:
http://www.youtube.com/watch?v=ex02NNtixys
http://www.youtube.com/watch?v=busrDXqna5o She paints a tree on muslin, starts about 3:48 in the video. Love her landscape quilts! Inspiring.
I am NOT sure these would be washable though...so I would ask ahead.