(Sorry if this posts twice; my original message disappeared after I clicked on preview).
Try this website:
http://www.stampin.com/tips/3-foldc2.htm
I have not tried it yet, so I cannot offer any tips/opinions. My current technique is to experiment with embossing powders. I just bought 3 jars at Michael's on Saturday (the snow started to fall while I was shopping; I had no idea until my DH called me on my cell phone to find out how close I was to home --- not very since Michael's is about 20 miles from home).
Anyway, I made my purchase and arrived home safe and sound.