When I first watched Alien, I realized that the ship they were searching had been crashed by the Aliens that attacked the crew of the ship Ripley(Weaver) escaped from the design of the ship looked beautiful and somewhat organic to me their technology on a par with that of Ripley's space ship but more rounded and beautiful. Then some of the same motifs showed up in Cameron's atmosphere plant in Aliens, with the obvious implication that they were part of the insectoid aliens' hive work.

All Giger designs, no doubt, but requiring separate origin stories and explanations.

I think an interesting movie in that same universe might have humans encountering live version the giant aliens of the crashed ship from Alien as a first contact and humans and giants battling the Aliens. I take it Prometheus was not that.