Before filling cups, pipe 1 oz. melted chocolate onto inside of each cup to make a design or write a spooky message such as "boo." Refrigerate cups until chocolate is firm, then fill as directed.
How to Make Spider Webs and OREO® Spiders
For spider webs, use 1 oz. melted chocolate to draw a cross on the whipped topping, then draw an "x" on the center of the cross; connect all ends of lines with additional melted chocolate to resemble a spider's web. For the "spiders," separate 10 OREO Cookies. Drizzle the filled halves with the remaining melted chocolate. Attach 8 (1/2-inch) pieces of black shoestring licorice to the chocolate on each cookie. Reassemble cookies. Cool completely. Place spiders on top of spider webs just before serving.
How to Make Ghosts
Drop whipped topping by spoonfuls onto each dessert to resemble a ghost. Add 2 miniature chocolate chips to each for the "eyes."