Fill 2 Moscow mule mugs with crushed ice. Squeeze 2 quarters of the lime into each mug; toss 2 lime quarters into each mug. Pour 1.5 oz of pomegranate vodka & 1/2 cup of the cranberry pomegranate juice into each mug and give a quick stir. Pour in half of the bottle of ginger beer into each mug. Top with fresh pomegranate seeds, if desired.