Since we can't decorate as scarily as our neighbors, we have done a few Halloween crafts / projects with Emma and Brooklyn to help decorate our house for Halloween (or for you "Jesus condemns all things Halloween" folks, you can call it "fall happiness decorations"). They're both pretty easy, and they make fun little mementos. Or at least, fun blog posts.
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Ghosts: paint the kids' feet with white paint. Turn the page upside down and paint eyes. You now have ghosts.
Mr. Potato Head Pumpkin: Get a pumpkin and put Mr. Potato Head accessories on it.