Fill slightly hollowed brownie cupcakes with a small spoon of gooey marshmallow cream and top with drizzles of melted chocolate chips. Pipe mini dollops of canned pink frosting (or white frosting tinted with red food coloring) over the top and sprinkle with edible glitter. Frost a chocolate cupcake with canned chocolate frosting, then sprinkle on chopped candy bar and chopped chocolate bar. Decorate a cupcake with white canned frosting tinted with orange food coloring; snip a large marshmallow to form petals and dip in colored sugar; add gumdrop to the center. Roll the edge of a pink-frosted cupcake in multicolored sprinkles.