Ingredients:

1 ice ring
1 40 oz. bottle grape juice (more if making ice ring)
1 48 oz can pineapple juice (more if making ice ring)
2 liter bottle of ginger ale or lemon-lime soda
2 oranges
2 limes
1 fifth Vodka (optional)

Slice oranges and limes in thin round slices. Set aside.
Place ice ring in bottom of punch bowl, add juices, then soda and (if desired) vodka. Float orange and limes slices on top and serve.

Source: fabulousfoods.com