Our afternoon technique was working with rubber stamps and embossing powders. If it laid flat and could be stamped, it was embossed. It worked very well on most things; fabric, hand made papers and card stock, balsa wood business cards from Lee Valley Tools, metals and mica.
One of the neatest things we discovered was making a non metal substrate look like metal. First off stamp your rubber stamp in the VersaMark ink pad and set aside. To achieve this great metallic look on non metal surfaces first coat the surface with a clear VersaMark ink pad then liberally coat with a metallic coloured embossing powder (silver, gold, copper), tap off the excess powder and heat with a heat gun. Repeat this 3 - 4 times to lay down a thick layer of the embossing powders. As soon as you have completed the final layer of the embossing powder and before it cools, quickly stamp your rubber stamp into the surface. Just a note, do not reheat after it has been stamped or you will lose the imprint. Askme how I know :)