How about a solid flat board with modular terrain pieces? That way it wouldn't be easy to eyeball distances. Most LGS do this. Maybe add some static but not too different parts on the board itself, like a slight elevation.
As for the theme: best to go natural or medieval. At least with medieval you can use it in 40k and justify that it's an undeveloped rural world. Sooo, still lots of options: forests, deserts, snowscapes, swamps, lava Mordor worlds, etc. When it comes to buildings, there are companies out there with Gothic buildings (Pegasus comes to mind) that doesn't rely on the Sci-Fi aspect of it, so they would still apply to other games. Those can be made into your "ruined factory" type of buildings. Ancient ruins also fit the genre in any game system, and there are sure as hell lots of terrain pieces available and tutorials on how to make them.
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