OK, now that I've seen some of the scans in this thread, there's NO WAY I would ever get anywhere NEAR the Dark Carnival!!
I always thought the Deviant Moon was creepy, but it's tame compared to the DC!
There are a few others, but I can't even remember which they are at the moment. Oddly enough, one that ought to be creepy kind of attracts me: the Wormweird.
But I LOVE the Hanson-Roberts and the Sacred Rose!
And as for that Morgan-Greer Devil, well, I always sort of took it for granted; but that hugely blown-up scan a few pages back did give me pause...!