Absolutely no clue if this was made before...
Anyways, this is a random mod I made in about an hour that I thought others would like. It looks pretty neat, if really really dark. :P
Some screenshots:
Helian T6 Hall:
Lunus T6 Transmutation:
Lunus T4 Smelting (With the lava mod!(which looks great with this but only works on some structures..)
Lunus Grand Hall:
Lunus T6 Library (example of max darkness):
Tell me if I missed any textures (include a screenshot if I do so I know which!)