My friend Carol Sweeney has been posting demonstrations of the techniques in Nancy Curry's book Texture Effects for Rubber Stamping for the Yahoo group Next Generation. This technique uses glossy card stock, alcohol inks, and mica or interference powder. You can find the directions in the section called "Flights of Fancy."
(Click on the image to see a close up)
If you don't own this book (and I highly recommend it), go to Carol's blog: