One hour of greeble (#5-#8)

For the love of greebles!
Getting tired to too big scenes with too much time wasted on things which will not matter in the later end result, i decided to take the complete opposite approach: No more than one hour of modeling for a scene and all models have to be created from scratch.
These are the results of the second round of "one hours greeble".
Light setup and compositing stays the same for each scene and was done outside of the one hour time frame.
Modeled in Blender 2.8 and rendered in Cycles.