It's very much what it say's in my brief description.
Any life form, other than humans, that lives in or around the sea will be allowed.
You choose any marine animal and make a team from it. You could also design a logo.

I forgot to mention, teams can also be based on real clubs or fictitious.

Thanks to Warrigal for resurrecting this creative challenge. For the benefit of those who were not on the site for the previous incarnation, it is about creative fun, not a competition. So post when you like. As usual, if you like someones work then comment under their design or private message them