Brandii, have you seen Penn & Teller's book called, "How to Play with Your Food?"
They show how to make a jello dish using a brain-shaped mold. You fill it with a small plastic baggie filled with red sugur syrup so when kids slice into it, the brain "bleeds."
I make cute little eyeball jello salad. I tried using an Internet recipe that called for gelling sweetened condensed milk but found it too much trouble. I just poke a blueberry into the hole of a canned lychee fruit, used a toothpick to make red food color "veins" and then placed all of the eyeballs into some scrambled lemon jello. Looked too real for some of the kids to eat!
Witches' fingers cookies, tinted a sickly green, with a sliced almond for a nail and red around the nail bed, and a wart or two, looked realistic, too!
We like to make a witches' cauldron of chili along with a Frito pie with cheese cut-outs on top to look like a jack-o-lantern!
Gotta have the green punch with dry ice "smoke" and a floating hand (make ice using a plastic glove.)
Caramel popcorn is a must! And sometimes, I make black and orange sugared popcorn balls, too.
Halloween is so much fun!
