If you still hadn't decided what design will be best for your Jack O' Lantern this year, perhaps consider making a Barack O' Lantern instead, for fun and prizes.
Yes We Carve: Download, carve, and share your Barack O' Lantern. Because every pumpkin counts.
There are stencils available if you'd prefer, but originality counts (well, according to the site it's "sheer awesomeness" which will guide the judges). The winner of the contest receives an 8gb iPod Nano.
You can also do your part to inspire neighbors, friends, and family by hosting a BYOP party in your city.