1. Bring ginger, sugar, and 11/2 cups water to a boil in medium saucepan. Reduce heat to low, and simmer 10 minutes. Remove from heat, and cool. Pour mixture through fine strainer, pushing down on solids to extract all syrup. Stir in lime juice and blueberries.
2. To serve: Pour 1/4 cup blueberry syrup into tall, ice-filled glass, and add 2 Tbs. vodka. Top with 2 Tbs. club soda.