Here are some thumbnails I did for a book cover project.
The book is called "Hellstrom's Hive" by Frank Herbert. It was written in 1973. It's about a "hive" of technologically advanced humans living as social insects in immense chambers deep underground.
Luckily, Herbert wasn't very descriptive of the architecture so I've got some freedom in that department. I wanted to use lots of 60 degree angles that will have the whole "hexagonal shape" look. I think it's convenient that that's the shape in common with bee colonies and 70's futuristic architecture.
Anyway, the final cover is going to be a combination of a couple of these thumbs, but mainly the top right one.