Pile handfuls of jelly beans in the center of the squares and napkins. Use licorice strings to tie each square into a little pouch, and pop a spider on top of each. Pile the Tricksters' Treats bundles on a large shallow bowl or tray, and set it near the door. Drape fake spider webbing above and around the tray. Thin black licorice makes legs for the spider body, which is a blob of black-tinted icing.
White jawbreakers make eyes, and a red jawbreaker makes the nose.
Pipe an open mouth with black icing and fill it with teeth-tiny white mints. Yellow gum balls are the eyes, black icing makes other features, and candy corn forms the teeth.