Buildings are frozen and nauvis looks frozen aswell. No ammonia on nauvis and no concret for buildings needed.
Large total conversion mods.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Map generation and terrain modification.
Things related to oil and other fluids.
Furnaces, assembling machines, production chains.
hmmm...
if you want it even more interesting try this mod with everything on nauvis and everything spoils ;)