This is a wonderful little bit of decoration anyone can add to their house for the Halloween season.
Step 1: Get yer gourd
Find a flanged gourd. You can usually find them where ever you can find pumpkins. (i.e. farmers markets, roadside stands, orchards etc.)
Take a look at it from the end. Find one that kind of resembles a face with a down turned nose, and is fairly symetrical. Also make sure that it can balance fairly well on it's side, with the point down.