Pour the blue Hawaiian Punch evenly into two icecube trays. Place the trays in the freezer until frozen solid.
Combine the frozen punch and pineapple juice ina blender. Add 3 to 4 drops of blue food coloring, if desired. Blend untilsmooth.
Pour the slush into 4 cups.
Place Swedish fish along the sides of each cup,then top each cup with a splash of grenadine. Garnish with gummy sharks.