I read about it on the polymer clay web months ago and I liked it very much, but I didn't really have the time to try it. But now! :) I just made for little beads, just to practice, and I was so happy with the result, that I turned them into earrings almost immediately they dried.
As you can read in the tutorial , you need alcohol based inks to do it, but I don't have any yet, so I used Pearl Ex powders, and I think it's very pretty like this, too. But off course, I just have to try it with ink, too!