How to Make It
Place blueberries in freezer. Pour lemonade into silicone ice cube molds; freeze until completely frozen, 4 hours or overnight.
Remove ice cubes from molds, and place back in freezer. Process about three-fourths of the frozen lemonade ice cubes and 4 ounces of the lemon-flavored vodka in a blender until completely smooth, agitating if needed, about 1 minute. Pour into 4 glasses; refrigerate until ready to use.
Process frozen blueberries, water, remaining one-fourth lemonade ice cubes, and remaining 2 ounces lemon vodka in blender until completely smooth, agitating if needed, about 1 minute. Top each glass of lemonade mixture evenly with blueberry mixture. Garnish with frozen blueberries; serve immediately.