Hey @adempius! The best way to do this is by using a WordPress plugin to create your own, customized form(s). There are many to choose from on CodeCanyon. This might be a good one to consider as there are many happy customers who have found it easy to use and integrate:
If you combine the above form builder with an aquatic-based theme from ThemeForest, you should be good to go. Here’s one I picked out for you, but you can find a lot more on ThemeForest if this particular one doe not suit your style:
You might be interested to learn that you can share what you create in our Made With Envato contest and can get a chance to win $100 by simply sharing what you create.
Good luck with the project, let us know how it goes!
For more recommendations and inspiration, you can also try the page below: