King-Reaper at Deviantart. My wife (who is much better manipulating printers and programs than I) got it to print out the right size so we could get it on the pumpkin. I used an Exacto-knife and a crab-picking tool to cut out the pattern and scrape it to about 3/4" deep. All in all about 3 hours of work but worth it.
Here's a pic of Jack O'Thulhu, Jack Skellington, and two more Jack O'Lanterns guarding our doorstep this evening.