Sprinkle 2 tablespoons crushed cookies into each of 6 mini trifle glasses. Pipe pumpkin pie mixture over crushed cookies, filling glasses 1/3 full. Spoon remaining container of whipped topping into a piping bag fitted with a star tip. Pipe a layer of whipped topping over pumpkin pie mixture. Sprinkle with crushed cookies, and pipe another layer of pumpkin pie mixture. Sprinkle crushed cookies in center, and pipe a border of whipped topping around edge of glasses. Refrigerate for at least 2 hours before serving.