Need idea's for a blue "ocean theme" nonalcoholic punch for a spongebob birthday party?

I really need a cool idea for some punch I want to make for my son's sponge bob birthday party. I am wanting to put some gummy sharks and gummy fish in it also, but I got to thinking and they will probably just float up to the top. I need to find a way to keep them down. The punch doesn't necessarily have... show more I really need a cool idea for some punch I want to make for my son's sponge bob birthday party. I am wanting to put some gummy sharks and gummy fish in it also, but I got to thinking and they will probably just float up to the top. I need to find a way to keep them down. The punch doesn't necessarily have to be blue. Maybe a light green or yellow. But blue is my first choice. THANKS!!
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