The books were so colorful in my mind, too. I hope the trend of desaturation to make things look edgy isn't used.
That said, I think the Tinkers will be dazzling. :)
I agree that it would be ideal to do a season per book, but by the same token, some of the books are mostly filler, and there is a lot of description and internal monologue. It would make more sense to play it by ear, so to speak.
I'm curious about changes the show will make. For example...