Another one with different cultures is the expanse, by James s.a. Corey. This is more different around the belters and whatnot.
Dune and the freemen are amazing. Some of the earlier parts (this is a massive topic!) are really different, with the bene Gesserit and fremen, tleilaxu gholas, etc
Certainly the culture, with it's post-scarcity absence of an economy stands out. I have read any from le guin, yet.
Hey, illustrators are allowed to hallucinate too!