Allow cake to cool completely, then cut or crumble into bite-sized pieces. Place a ring of maraschino cherries at the bottom corner of a large clear bowl or trifle dish. Alternate layers of pudding, whipped cream, and cake, taking care to make each layer distinct. Just before the last layer, place another ring of cherries around the circumference of the dish, then cover with the next layer. Garnish with a dollop of whipped cream, crumbled cake, and a single cherry. If possible, refrigerate for 30 minutes prior to serving.