In a large 8-quart punch bowl, combine vodka, coffee liqueur, and heavy cream. Stir gently to create a marbled effect. Top the punch with dollops of whipped cream, swirling it slightly to create a cinnamon roll effect. Sprinkle ground cinnamon over the whipped cream for garnish. Serve with a ladle, pouring into glasses. Garnish each glass with a swirl of whipped cream and a light dusting of cinnamon.