MythBusters busted a whole ton of biometric scanners. From simple ones that they simply xeroxed a finger, to more elaborate methods of using chemistry to "engrave" a finger print into copper plating and then creating silicon molds. They busted scanners for laptops as well as cheap and expensive finger scanner door locks also.

One trick was, get a finger print (in this case, from a cd jewel case) and dust it. Then do the crazy glue method to make it stick to something. They scanned that in via a computer scanner, printed it on a clear plastic ala overhead projector type media. Then used a sharpie to fill in the lines. Rescanned that back to the size of the finger, and then printed it.