How about a children of WZ / like if a hellion mated with a behemoth, what would the offspring look like and what perks...
How about creating an enemy that both factions would have to overcome by actually working together i.e. a rise of the machines / skynet situation that hunts both humans and zombies...what classes / perks would they have
Since holidays are coming up, best WZ decoration / ornament / table centerpiece / etc (would involve actually crafting somthing and verifying like pumpkin contest did)
Just throwing a few out there to see if anything sticks.