If I thought I could pull it off (and it wouldn't terrify my three-year-old), it would be a major artistic challenge to try something like this- but what a cool result.
I also like the idea of stacking pumpkins and gourds. A tower of Halloween greetings for any style....
When the carving goes beyond goofy or scary faces it can result in really beautiful seasonal decoration- the second set of carved pumpkins are truly elegant.
Finally, how could anyone resist something like this sitting on the front porch?
{All images courtesy of Google images}
To get you started on your own jack-0-lantern, howstuffworks has a comprehensive pumpkin carving tutorial- everything from the very basic to the extremely ambitious.