Drop the blueberries into your cocktail shaker. Muddle thoroughly.
Pour in the blueberry lemonade, add the vodka, and fill the shaker halfway through with ice.
Shake thoroughly.
Place one big ice cube into the glass and pour the ingredients from the shaker through strainer into glass.
Add lemon-lime soda into glass, stir gently.
Garnish with sour belt candy, if wanted, and enjoy!