>>82495456From what little I've read?
Amethyst, Princess of Gemworld
Jack Kirby's The Fourth World
OMAC
Kamandi
Though honestly, I've never finished any of those. Yeah, I know, I know. Also they're more Bronze Age stories.
I've also read a few Silver-Age Superman stories here and there. One in particular that stands out to me is Action Comics #544, the one that reinvents Lex Luthor and Brainiac.
Frankly I'd like to read more Silver-Age stories. I miss that sense of raw innocence and wonder.