For starters, try a blueberry-infused gin: Combine 1 cup gin with 1/2 cup blueberries in an airtight container, and let stand at room temperature for 3 days. Strain, and refrigerate (up to 3 weeks). Top a jigger with tonic or sparkling lemonade, and garnish with frozen berries.
Kids will love a homemade red, white, and blueberry concrete, a "milk shake" so thick, they'll need a spoon: Layer 1/4 cup softened strawberry ice cream, then 1/4 cup softened vanilla ice cream in each of 4 glasses. Blend 3/4 cup blueberries with 1 cup vanilla ice cream; divide among glasses.