I literally had no idea what I wanted to carve on my pumpkin until minutes before I started carving... I just looked at all my ghost Pokemon plush and decided to pay homage to one of the original ghost-types!
This is probably the hardest pumpkin I've done to date. I've never been too successful at the "partially removing" technique (where the carved surface is thin enough for just some light to shine through), but I think I really pulled it off this time. I'm definitely most proud of the teeth part!
EDIT: I just googled "Pokemon pumpkins" today (10/30/12) and was surprised to find this pumpkin on at least two different websites. Thank you to whoever recommended my pumpkin! Stay tuned for this year's (working on it tonight)!