I think on of those images is maybe a Davids Dream..... after Dr Shaw rejected him because he was a Robot.... so he thought to himself... i'm only a Robot... well this is what i'm thinking lol
some nice concept works here, and Art..
I do wonder if we will see a Giger Type Atheistic from the Engineers should they return and eventually indeed seeing a Armada of sorts of Bio-Tech Ships like the First Image would be interesting.
But i cant see this fitting with the Franchise... not as far as a Armada of Engineer Ships who are Hell-bent on Mankinds destruction or even a Mild Beef with us.... because showing a Large Scale Engineers with knowledge of how Mankind Turned out and the events from Prometheus on-wards, does leave a bit of a Plot Hole well Continuity error as far as the Franchise.. because we have to ask how come Mankind is still around at the time of Aliens in 2179 never-mind much latter in Alien Resurrection.
Mind you RS can choose to Reboot the Franchise after Alien, and so if the Engineers never had any knowledge or problems with us at the time of 2104 but they do after they discover what David has done and the result of this leads to death for them and the Derelict a few years latter in Alien.
A Reboot of Aliens could show Aliens replaced by another attempt by the Engineers put a stop to Mankind... and thus RS comment about War of the Worlds... But i dont think FOX will Reboot Aliens etc...