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Cyanogenmod has a feature that lets you randomize the numbers on the keyboard each time you try to unlock it, if you use a PIN.

can you explain this a little bit more?

The numbers on the keypad appear in a random order so you’re touching different parts of the screen each time, even though you’re entering the same code.

1. Place phone on scanner-bed

2. Open mirror image of fingerprint in photoshop and maximize contrast, crop to fingerprint alone

3. Print finger print mirror image to UV-stencil-type material

4. Etch into UV-material w/ UV printer

5. Pour rubber/plastic-type material over UV etching

6. Remove rubber thumb, apply to fingerprint detector, voila..

Though since you know the shape you'd have to get someone else to try unless it's really clear.