Prepare the pudding according to the package directions. Once the pudding has set, stir in enough blue food coloring to make the pudding light blue, 3 to 4 drops.
Place the purple and yellow chew candies in a small microwave-safe dish. Microwave until the chews are just softened, about 10 seconds. Use your hands to mix the chews together until they are a purple-gray color. Flatten the candy into four 2-inch squares and use kitchen shears to cut each into a shark fin. Dust the fins in confectioners' sugar and brush off any excess.
Whisk the heavy cream in a medium bowl until stiff peaks form, about 3 minutes.
Remove 1 tablespoon graham cracker crumbs and set aside. Divide the remaining crumbs between 4 clear cups. Add 1/2 cup of the pudding mixture to each cup. Sprinkle the reserved graham cracker crumbs on one side of each cup to mimic a strip of sand on the beach. Spread the whipped cream in a line just behind the sand to make it look like crashing waves. Stick a shark fin in the pudding water. Put a gummy ring on the pudding water and stick a graham cracker bear in the middle. Serve immediately.
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