Last year I was a bit rushed at the last minute to set up my front lawn (this year I'm making up for it), here's an idea I had from things laying around that worked out pretty good.
Here's all you need.
Rod iron tiki-torch (not the wicker kind)
Jack-o-lantern, of a face, not the artistic drawing type-like kind. (Hopefully, you already have one)
Fill the torch with oil (whatever you normally use)
Cut the bottom of the jack-o-lantern out in about a 30 degree angle, leaving about a 1 inch hole in the bottom.
Poke 2 holes on either side of the jack-o-lantern, about 3 - 4 inches apart
Place jack-o-lantern on top of torch
Tie one of twine around the circle base of the torch
Bring it up on side of the jack-o-lantern
Put it inside on hole, and out the other on the same side
Bring the twine back down to the bottom of the circle and tie off good and tight, but not so tight it cuts through the pumpkin.
Repeat on the other side, and in front (using face openings, I had tried hiding the twine first, but it looks cool crossing the face anyway) and back, just make sure you don't run the twine through the center or else it will burn.
Make sure it's good and secure.
Stick it in the ground, far enough away from where people may be walking.
Drip fake blood (or real, whatever) along the bottom of the eyes.
Remove top of jack-o-lantern
Fire it up!