I need a holloween cake recipe for a contest at my job need ideas please:)

You could do cupcakes, decorating each one like a classic horror movie monster :)

Check out this link at marthastewart.com There are some terrific halloween cake ideas
http://www.marthastewart.com/275112/halloween-cakes-and-dessert-recipes/@center/276965/halloween

A spider cake! http://food52.com/blog/8616-homemade-halloween-spider-cake