Maybe the
Living Dead Dolls can inspire you, here some pictures I've found:
I suggest you take a white plastic mask (such as a venetian style), and cut it out of pieces in a "broken glass patern".
Then fix up these pieces on your face (perhaps you can try spirit gum?) and accentuate the contrast by make up your skin in black between the cracks.
Hope this will help you a bit...
Good Luck, and post pictures of you as soon you've done it!
