Spooky 7-Layer Taco Dip If seven-layer dip is your go-to party app, you only need a few small changes to make it wonderfully Halloween-themed. Leave guac as the top layer, and use sour cream to decorate with a spiderweb design — or anything else spooky that strikes your fancy. Get a full how-to in this recipe for spooky seven-layer taco dip. Image Source: Shugary Sweets