How to create Jackolantern patterns
1. Gray scale an image
2. Increase Contrast
3. Decrease Brightness
4. You'll want to have it dark enough so there aren't alot of large, floaty, unsupported black parts, but bright enough to still recognize the image
5. smooth out some of the borders to make cutting easier and get rid of some small floating white and black islands.
6. Take out a pumpkin and start carving.
get inspired:
http://www.jack-o-patterns.com/Carvings2005.ivnu
I'll post a more detailed tutorial soon.