capture the flag would be great. 2 flags a huge distance apart guarded by arrow shooting turrets and room releasing enemy players further behind it.
take the fort would be simple. a fort with ramparts for archers. a keep which the fort holders instantly restart when the die and a gem they are guarding.
war mode would have vast amounts of monsters spawning and charging into battle against the players. basically an epic battle.
assassins mode would have a building with patrolling guards and a particular one that you have to kill. basically impossible to fight your way threw.
the hunt would be a forest like area at night with werewolves in it. if you are a patron you can play as a werewolf. if not you can try hunt them.
tag mode would be simple. a basic map with no buildings. 2 teams and when you kill someone on the other team they swap to your team.
there are many other ideas i have come up with but these are the main ones.
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