1/3 cup blue passion fruit liqueur, such as Hpnotiq or Alize
1/4 cup fresh lime juice (about 4 limes)
2 tablespoons blue curacao liqueur
2 tablespoons white rum
2 tablespoons sugar
The blue layer: Blend 1 1/2 cups of the ice cubes with passion fruit liqueur, lime juice, blue curacao, rum and sugar. Blend until slushy and there are no chunks of ice left, adding the remaining 1/2 cup of ice if needed. Transfer to a large measuring cup or small bowl and place in the freezer while you make the next layer.
For the red layer: Blend frozen strawberries, watermelon, lime juice, rum and sugar. With the motor running, add the ice, a few cubes a time, until thick and smooth. Stir in 1 to 2 tablespoons water if the consistency is too thick. Transfer to another small bowl and place in the freezer while making the final layer.
For the white layer: Blend coconut sorbet, rum and lime juice. With the motor running, add the ice, a few cubes at a time, and continue to blend until thick and no bits of ice remain.
Pour the red layer into the bottom of six 8-ounce glasses, about 1/3 cup each. Gently spoon 1/3 cup of the blue layer over the red layer so they stay separate. Finish by spooning 1/3 cup of the white layer over the second layer in each glass!