No one will dare darken your doorstep while this aging, spider-infested wreath hangs over it. The secret is reindeer moss, actually a lichen. 1. Hot-glue handfuls of moss to a Styrofoam wreath form until covered. 2. Apply a thin coat of craft glue to plastic spiders (available at Halloween stores); sprinkle with black glitter. Hot-glue spiders onto wreath.