Martha Stewart is a great resource for holidays, and she has some excellent pumpkin ideas.
For parties or just decoration.
here are some of my faves:
Besides the awesome face on this pumpkin, here is a great tutorial on how to light your pumpkin not using candles
Why not use it as a drink cooler for your awesome Halloween or Harry Potter party
or maybe this
I love these pumpkin creatures
Mice motel...so funny
How about a Cinderella Coach to go with the mice
Who doesn't like a little glitter
I love this haunted house
Another great party idea
A pumpkin candy dispenser? yes please
Have a few spare pumpkins lying around? use cookie cutters
I love this idea of using the mini pumpkins as name place setters.
And we might as well add a Harry Potter pumpkin in the mix. Free Stencil here
or maybe you'd prefer doing the Dark Lord, he who must not be named
or my personal favorite character, Snape