Attention last minute gourd decorators! I found two how-to videos (well, one is a series) detailing how to make an easy - or an elaborate - jack o'lantern for Halloween. Scroll through the video bar below. The first is the easy Duct Tape Pumpkin. Sure, you could go nuts with the tape if you wanted (see the examples on her table), but I think one shown in the picture above will do in a pinch.
If, on the other hand, you want to get cuh-ray-zee with the squash, try the elaborate Skull Pumpkin detailed in videos 3-8). Yes, six videos. That should give you an indication of how involved it is, but look at the results!