So yeah, I’m going base-level here and making an industrial-style room like you would find in your standard FPS: Wooden boxes, a crate/chest for an item, metal barrels, drain cover in one corner, industrial lighting, metal shelves, cinder-block walls and concrete floor with a bay door at one end of the room. I’d like it to give the effect of a slightly dirty garage. This is the kind of stuff I’ll need to be making for an upcoming project, so this is good practice. 
In addition to the standard item meshes, I’m hoping to see if I can make explodable meshes; the drums and crates, for example, should be disassemblable in a way that they can still be present after being destroyed by the player. And for the walls, I’ll be making an explosion ball that can be used by the level developer to create a variety of holes in building walls.
Floor texture will be dirty concrete. Walls will be cinder-block. The bay door will be the sort you see in loading docks.