Since it has been advertised, I'm looking close to those new imperium decors. The bad new is: how on earth did they add to all fronts of walls thoses tiny details of techo metallic things?
The good news is, you can build many things and if you don't paint those details, youi got your ruins and cathedrals, with high decors. You can hide those metalic details with some foliages, or some more ruins...
I'm planing to go this way for (mainly) AoS and will use for both AoS and 40K