For a shade of blue that leans more turquoise, try the Polar Blast flavor of Hawaiian Punch instead. And something to note in general – the slight yellowish tint to the white grape juice will naturally turn either flavor of blue punch slightly more turquoise, too. (Same thing with pineapple juice if you choose to swap that for the white grape. The more yellow the juice, the more greenish-blue or turquoise the punch.)
Creative Drink Display
Serve the punch in a clear drink dispenser embellished with pirate-y trims like nautical rope, chains, and giant craft jewels.