Divide blueberries and mint into each glass. Add 1 teaspoon sugar and slice of lemon.  Muddle ingredients with a pestle or wooden spoon, keeping the lemon slice intact.  Add in ice cubes.  Add 1 to 1-1/2 ounces vodka (or gin), 1/4 cup lemonade and even amounts of sparkling water to each glass. Stir and garnish rim with slice of lime and a mint leaf ~ AND more blueberries if so desired.