I've just posted my first tutorial. This one shows how to turn a bottle cap into a cabochon which I use in my bead embroidery projects. They can also be used in any art project where you want the surface of the cap to be the focal point.
The first 12 buyers also receive a 20% off coupon.
http://www.etsy.com/listing/73162830/bottle-cap-cabochon-tutorial