Make the Blueberry Lime Syrup: In a small saucepan, combine blueberries, lime juice, and lime zest. Heat over medium until blueberries burst and syrup thickens slightly (about 5 minutes).
Mash gently with a spoon and strain through a fine mesh sieve. Set aside to cool.
Prepare the Colada: In a blender, combine coconut milk, coconut rum, light rum, pineapple juice, blueberry syrup, and ice. Blend until smooth and creamy.
Serve: Pour into glasses. Optional: drizzle a little extra blueberry syrup for swirl effect.
Garnish: Top with fresh blueberries, mint, or dried lime slices for a festive presentation.
Optional Variation: For a frozen version, add an extra ½ cup ice and blend until slushy.