Law and order
Inspired by TV and film
Collapse of empire (or more broadly politics and geopolitics)
[Picking up Remi’s suggestion] *punk (cyber, steam, 80’s...) so long as there’s some encouragement to emphasise the “punk” not just the aesthetic.
Pre/post/un-human. (Cat, Mouseguard, Eclipse Phase with exotic morphs and AIs, truly monstrous PCs in D&D....)
The settings are usually post-industrialdystopias but tend to feature extraordinary cultural ferment and the use of technology in ways never anticipated by its original inventors ("the street finds its own uses for things").