This is a really fun recipe idea for a meatloaf shaped like bloody monster feet! Follow this link for a recipe:
http://www.instructables.com/id/Feet-Loaf-Disgustingly-Delicious-Simple-Main-dish/
If you don't do beef at your house, substitute ground turkey in any meatloaf recipe.
Here's a veggie loaf recipe using mashed lentils as a base: http://www.food.com/recipe/really-good-vegetarian-meatloaf-really-33921
A quick internet search yielded many more veggie versions.
Lots more fun Halloween ideas HERE