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PLACE 1/2 cup sugar into a small saucepan.
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ADD 1/2 cup water, 1 package blueberries, and 1/2 cup mint leaves.
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BRING blueberry simple syrup to a simmer over medium heat and STIR occasionally until sugar dissolves, 3-6 minutes.
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MASH berries gently with back of a wooden spoon.
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REMOVE from heat and ALLOW to cool to room temperature.
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STRAIN blueberry simple syrup through a fine mesh sieve into a tall pitcher and DISCARD solids.
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STIR in 1 cup lemon juice.
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STIR in remaining 1 ½ cup water and aside lemonade.
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DIVIDE 1 cup ice cubes between 4 tall glasses.
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TOP each glass with several blueberries.
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DIVIDE lemonade between glasses.
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TOP with seltzer water, if desired.
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SERVE Blueberry Mint Lemonade immediately.