Add ice cubes to a cocktail shaker, then add the cream, coconut syrup, grenadine syrup, Jamaica rum, vodka, London Dry gin, orange juice, and lemon juice.
Shake for 15 seconds.
Fill a serving glass with crushed ice or ice cubes (optional), then strain the cocktail into the glass.
Slowly pour the blue curacao syrup over the back of a bar spoon to float it on the surface and create a color gradient.