If you can find the Pomegranate/blueberry juice combination, use 1 oz. Otherwise use 1/2 oz Pomegranate juice and 1/2 oz Blueberry juice.
Slice oranges in half and peel. Put half of one in food processor or blender and puree.
Squeeze juice from other 3 halves and reserve.
Half fill glass with crushed ice.
Pour in half the Tequila, Add half the Pomegranate/blueberry juice.
Add Orange puree on top, then the reserved squeezed orange juice.
Add rest of Tequila, then rest of Pomegranate/blueberry juice.
Muddle slightly with swizzle stick or straw.
Top with Maraschino cherry and serve.
More info on how to make a Tequila Swamp