If you had a big enough mantle over your fireplace, they'd also look great there.
Speaking of fireplace mantles, I also love this idea:
mantle with the pictures, but this is very creepy and haunting, don't you think? Some inexpensive black frames, a few pictures printed out from historical sites or family genealogy, a smattering of candles, and a little cotton batting and you're in business.
Here's another relatively easy and inexpensive decoration if you have a sidewalk or garden path, or even a patio you'd like to surround with cheerful Halloween faces. Hang the carved jack-o'-lanterns from shepherd's hooks using hangers made out of heavy-gauge wire (easy to find.) Use battery-powered candles to keep the pumpkins lit without risk of fire.
Tell me these little guys aren't cute! Use plastic-foam balls in different sizes and draw pupils using a permanent marker. Use a toothpick or stick to hold eyes together and attach pairs of eyes to a bench or fence or any other dark-colored background. I'm visualizing them on the shelves of a bookcase.
Doesn't that make the porch look warm and inviting?
Last, but certainly not least:
Ahhh, well, I won't be doing any of these things this year. Maybe next October