I for one wouldn't mind seeing more water-based events. For example:
Becalmed
Requires: A naval unit on an Ocean tile
An eerie calm has settled over the ocean. The waves have been stilled, the wind has ceased to blow, and our ship drifts aimlessly without so much as a breeze to fill her sails.
- There is nothing we can do but wait. (Units on that tile are immobile for 1 turn)
- Have an adept in Wind magic conjure a gale to get the ship moving again. (Requires Air mana [and possibly Knowledge of the Ether as well?]; the units are able to move normally)
And another, less "common" event idea:
Ghost ship
Requires: A coastal city (with a Harbor?); could also be modified to happen to a ship at sea
A mysterious ship has drifted into the harbor of [city name]. It appears to be in good condition, but it flies the flag of no known nation, and its crew is nowhere to be seen. So far, no one has emerged from the ship, and the townsfolk have not dared to approach it, fearing that it may be cursed.
- They are superstitious cowards. Order them to board the ship and claim it for our own. (Receive a free ship of an appropriate type, along with a chance of one of several additional effects):
The rotting remains of the crew emerge from below decks to defend their ship. (Several Drown units [or worse] spawn outside the city)
The crew are found within the ship, dead of an unknown disease. (Greatly increased unhealthiness in the city for several turns)
A lone crewman is found hiding within the ship, incoherent and violently insane. (Receive a free Lunatic)
The ship is deserted, but holds much valuable cargo. (Receive a modest cash prize)
A mysterious map is found in the captain's quarters. (Reveal the location of a treasure chest [or dungeon?])
As several townspeople board the ship, it shudders and sinks suddenly into the water, taking them with it. (Lose the ship, gain unhappiness in the city for several turns)
- They are wise to be prudent. Scuttle the ship, so that whatever curse claimed its crew will not spread to the town. (No effect, bad or good)
I'm not too concerned with whether these make it into the game (although that would be nice); I just get a kick out of thinking them up.