I am no blueprint master, but my lead programmer and I have worked together to come up with some really cool systems that allow us to randomly spawn items and weapons and gear based on tags, randomly spawn interiors and randomize level layouts. There are so many cool bts systems in NMRiH2, that screenshots of maps don't do them justice. Screenshots of prefabs don't do them justice either, but it'll do until the public can play the game.
These prefabs are mostly for Level Artists to place around the maps to make life easier when it comes to both set dressing and adding spawners for items and gameplay elements. These are by no means all of our prefabs, but merely examples of some of the many dozens that we have made so far. They are made up of both original assets and customized marketplace content.
Also, every vehicle, shelf, gun safe, locker, cabinet, office desk, and shipping crate are also all prefabs with interactable elements and item spawners, but those aren't as neat to see screenshots of.