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

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..

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.