There is this problem where you have to make many unique locations even though the underlying assets are the same.

I think it would be cool to solve it not by randomisation but by embodying first person perspective and throwing trash around using physics, spray walls with grafitti, use liquids, brushes and then bake it and save as complete level. Sort of 3d painting but on surfaces and uses physics so it is natural.

it would be much better than painfully placing stuff by hand and making grafitti, oil spill, dirt textures manually in photoshop with pain and torture for each corridor. You would just hop in instead and do a bit of a mess, kick some props with a baseball bat. Piss blood on the walls (optional)