I am blanking on the title or author but I read a Fantasy book years ago that had worlds based on the four elements: Earth, Air, Fire and Water and one thing I found interesting was rather than making the Fire world a cliched Volcano and Lava filled place, it was an unbearably hot steamy Jungle World. I thought that was a creative take on it.
The setting of Brave New World was also one of my favorites. A Dystopia that is insidious because plenty of people wouldn’t even agree it was a Dystopia.
Piers Anthony is apparently an awful person and the book quality sank very quickly but I always enjoyed the setting of the first three Apprentice Adept books. The Game on Proton was very cool and the way Magic was presented in Phaze was interesting (Each Adept having a Color and Style of Magic).
The Star Trek Novels’ take on the Breen is inspired. It is essentially a mini Federation that has taken Equality and Meritocracy to extremes. The member races are all forced to wear those helmeted uniforms even though only one of the races actually requires them so that everyone is the same and on equal footing.
Those are a few that came to mind.