I did homemade carmel corn the other day. I got some "mushroom" popcorn at our local Farmer's market. It's the kind of popcorn used for Cracker Jacks - a dome shape and a stiffer popped mass to take the stress of hot carmel. The carmel is is, there are a zillion recipes - brown sugar, molasses... I didn't have Corn Syrup so I subbed in some real maple sugar.
I made a cake in the shape of a huge spider (one small round pan for head, large one for body). I used Hershey's black magic cake so it was dark. I cut the top of the body off, scooped out the center, filled w/ red pudding and gummy worms and bugs, put the top back on and frosted. I used black licorice for the legs and decorated the plate w/ piped chocolate lines to look like a web. When we cut into it, the red pudding and bugs goozed out.
For something simple w/ kids, I crush oreos for dirt, make pudding w/ gummy worms for a dish of dirt. I write RIP on the top of Pepperidge Farm milanos and put them into the dirt.
I pipe my cheese straws to look like finger and put an almond sliver for the nail and call them witch's fingers.
We do a crudite platter that looks like a skeleton.
You can do pigs in a blanket to look like a mummy,
Bat wings....really hot wings just use food coloring to make them look black
Love cupcakes with gummy worms
One year our church's bake sale was just before Halloween. A big seller was what I called "Monster Munch". It was a sweet/salty mix of whatever I had on hand: popcorn, pretzels, m&m's, bagel chips, chocolate chips, candy corn, etc. I found Halloween-themed cellophane bags at the dollar store (10 bags/$1) and put the mix in those. I was surprised at how well they sold!
1 bag of chowmein noodles
1 bag chocolate chips
1 bag butterscotch chips
1 can peanuts
Melt all the chips together. Toss the chowmein noodles and peanuts together. Combine the two sets. Use tablespoons to drop onto wax or parchment paper to cool.
You have spiders!
These may be too labor intensive for your big crowd, but I love them!