Unfortunately, I cant play the game right now, but some good ideas would be:
-A screenshot of the mall hallways, still filled with zombies.
-One of those mega vehicles Lorkins and Ekarus often Create.
-Either the cult cabin, normal cabin, or ruined cabin in the middle of the woods.
-The Vault would be nice, but its possibly a strong spoiler so I would pass on it.
- A Gothic church surrounded by zombies, or any structure actually, but I think the church is better for the extra symbolism.