After my new sky sphere put space over our sim's heads, it's time to put space under their feet, too! :D
These terrains are a mix of several actual photographs of our Moon. I think I got the majority of them from Wiki Commons, in the end most of them originate from the NASA, of course.
Until I come around to proper replacements for neighbourhood traffic and street signs I recommend using Hexameter's no traffic and my invisible stop signs mod.
The roads are reduced to futuristic lines of lights, that makes them very subtle and practically invisible from a moderate distance. I think this is perfect for BACCs: You can have a full grid of streets big enough for the end result without it looking weird while you start out small. On a side note, space colonisation is the perfect setting for a BACC (Build A (Space) Colony Challenge ;)), and asylum challenges, too. Subtle roads make placing lots a bit tricky, though. I recommend switching to night time so the ghost cars' lights give you a better idea.
The grey Moon terrain replaces the lush/temperate terrain (that one has the greatest variety of textures).
DOWNLOAD DEFAULT TERRAIN TEMPERATE-MOON
ALTERNATIVE DEFAULT FOR CONCRETE TERRAIN
Next is a replacement for the desert terrain, coloured after the pictures we got from Mars.
I hate how limited the textures are in lot view. :|
DOWNLOAD DEFAULT TERRAIN DESERT-MARS
(updated with double lights roads)