The water, water troops? Water defenses??
So there's great water just sitting there.. My thought, why not try to use it?? In everyone's map there's water. We should be able to put special buildings ere. Maybe at th6-7 have water converters, and water mills. Water converters, convert water to elixir (and of course later on dark elixir) and water mills take rock in the ocean and turn it to gold (or create a new currency only found in the water?) then we could have boats that patrol arround a small selected area, and shoot (weak damage.. Maybe cannon esque)
Then comes water troops, maybe have a fish your wizards harnessed the power of that spit acid. I don't know. I'm unsure if maybe these troops have to stay in the water or if there could be one that could go on water or land, but this is an idea of mine I'd actually like to see come through.
