My kids didn't really love the guacamole, but that just meant there was more for us grown-ups:). They still ate the chips and thought it was cool though.
tortilla chips (those are the witches' hats--it'd be cuter with colored ones, but I couldn't find any)
2 Tbsp. salsa
Mash avocado with the salsa, garlic salt, and a spoonful of sour cream. Spread in bowl. Put a Tbsp. of sour cream in a baggie, twist, and cut a small hole in the corner of the bag. Swirl around in circles and make it like a spider web. Serve with tortilla chips! I think I'd add some green food coloring to make it more Halloween-ish.