Tower Defense? MOBA? In my XIV?
After the game is all polished and looking spiffy, I think a great way to attract some players and a great way to have fun would be a Tower Defense (PVE) and Moba (PVP) style games in FFXIV.
It'd be easy to do the maps.
For Tower Defense? You use a menu to go around hiring Mercenaries (Goblins, Sell swords) and whatever who stay in a small area and attack anything nearby. While waves of monsters run through trying to get to the end, and you and your party can even join the fray and attack along side your mercenaries, Standard Tower Defense mechanics would be easy to introduce also (Immune to physical, Weak to Magical) Winning would give you an ingame currency you pile up to buy some unique PVE items.
For Moba?
Have a map designed in the standard three lane structure, have monsters for buffs hidden throughout the woodland (Jungle) areas, and some areas (Like Grass but not grass maybe little pads where you turn invisible or something) that act as the standard hide in the Moba grass so no one sees you. Have creeps running down the lanes to turrets (I'm sure the XIV team would give everything a cool name XD)
Honestly it could be done just about any way, They could do it where you use your normal characters and you get stat increases ontop of your usual when you get EXP and level up. Or they could make it like a traditional moba and everyone starts out at level 1. They could even have an item shop to buy item builds like a normal moba or not. I think it'd be a fun PVP game to play inside XIV. :3
Come on you know that'd get players those Moba games are all the rage right now, and tower defense, who hasn't played one in the last two years?