Another idea i've avoided pitching for while since it would require having to map in a 3D space and may not get much attention either way (it's slightly genre bending even if it's technically a sci-fi) is a NRP based around putting high tech tribes and city-states with strange cultures in a large artifical complex filled with amoral machines, strange wild life and alien geometries.

In general a NRP with sci-fi/modern tech but on a small scale as oppossed to a galactic, interstellar or even planetary scale.  And when I say this, I mean without having some 'greater context' for said scale- all the nations involved fit within a single artificial faculty and whatever goes on outside the artifical faculity is irrelevant or non-existent.  Leaving the faculity would be pretty much impossible- it'd just be seemingly endless layers of hard to drill through rock.