For the mint lime simple syrup: Add the lime juice, honey, mint leaves and 1 cup of water to a small saucepot and bring to a boil. Stir until honey is dissolved, then remove from heat. Let cool and strain out mint.
For the salsa: Put the blueberries, pomegranate seeds, grapefruit, kiwi and mango in a bowl and add 1/4 cup simple syrup (save remainder for another use). Gently toss and garnish with mint leaves.