In a large punch bowl, combine a 2 liter bottle ginger ale, pineapple juice and white grape juice.
To make an Ice ring for the punch bowl: Fill a ring-shaped cake pan to 1/2 with ginger ale. Freeze until partially frozen. At this stage you can place edible flowers, or pieces of fruit around the ring. Fill pan with ginger ale and freeze until solid. Place in punch bowl just before serving.
