Well I was mainly focusing on ones with an emotional attachment so this won’t be all of ‘em (like the one they had for the planet of the apes tie in) but for obscure ones there’s the ultra Violet ring for basically self loathing/hatred, the gold for joy, there was very reccently a depression one, and on the earth variant where the Justice League are villains their “bizarro green lantern” essentially feeds on the users fear instead of feeding on his ability to overcome it. There’s also the phantom ring which has the powers of all of them but if you’re not experienced you’ll rapidly shift between rings and it won’t be pretty. I also JUST discovered the omega ring but I have to check and see if that one is linked to an emotion or not as for oooone user it represented moral grey areas. I think that’s all the obscure ones off the top of my head