Many Mom's and Dads have kids that enjoy the gross stuff. I know that I was one of those kids. I never grew tired of those cans of slime.
Here is a pumpkin ideas for people with kids like me. Drill a few holes in the pumpkin and put some gummy worms in them. Make the face appear to have the expression "I cannot believe worms are crawling from my cranium". It will be cool.