Like dreadnoughts? I'd argue fantasy and science fiction is all iterating over itself endlessly and there's creative ways of doing it. Plunging dragoons into a liquid bath puts dragoons at something of a cross-section of evangelion and 40k tomb-mech.

I could go on. The ghosts exhaling poison vapor with spider eyes or hydralisks vomiting buckets of saliva. Sunken colonies with their long knife-tongues; the Creep. As a whole I think Blizzard really made something special.