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Definitely Jacob's Ladder. Great surreal, psychological horror. There is a little bit of carnage, but nothing over the top.
I recommend Session 9. It's one of my favorite atmospheric, psychological horror movies of all time. Carnage is sparse, but effective.
Black Swan, unfortunately, is not talked about much in horror circles, but it should be. Amazing film. Tense, moving, and psychologically twisted.
Sauna is a great psychological horror film set in medeival times with a ghost/supernatural theme. Highly recommended -- it's in my top 20 films of the decade.
Vinyan is a great survival horror film set in the jungle -- an atmospheric & psychological take on the cannibal theme. Not much blood is spilled, but you're expecting it to at any time. Thematically, a little depressing though, in case that's a concern.
Clean, Shaven is perhaps the best example of psychological horror/thriller I can think of. I can't remember if any blood is spilled at all. However, thematically it is very disturbing, so it still might be a difficult watch for the squeamish ones in your group.
I don't know how far you want to go down the weirdness path, but one of my favorite psychological arthouse horror films is Possession (1981). However, it's a bit on the existential side, and the acting is intentionally overboard, so a few in your group are guaranteed to hate it.
A pretty good indie psychological horror flick is Absentia, which might still be on Netflix streaming. No blood that I can remember, but pretty effective tension is built. Not very fast moving, so it requires some patience.
Bug is purely psychological. Claustrophobic and tense, the horror is purely in the minds of the main characters. A small amount of body horror, but no carnage.
Good luck, and welcome to the forum!
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