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A place like Party City will have tons of decorations for cheap, also any dollar store will do great. You could also have everyone carve a pumpkin. Lots of people have pumpkin carving parties these days. A great place for pumpkin carving stencils is www.zombiepumpkins.com.

Depending on the amount of people at the party you could have everyone come dressed as a Zombie and have your own "Zombie Walk" through the town you live in. Zombie Walks are becoming quite popular also.

This site has a few recipes on it for anything pumpkin.

http://www.pumpkinmasters.com/recipes.asp