A weird thing I've noticed is that if you get a 2 red/4 white skull corpse, then pick the right important organ to remove the two red skulls, if you then remove the fat and blood afterwards, it'll contribute a passive +2 graveyard rating when it's buried, even if there's no decorations on the grave.
I'm thinking this is a bug, maybe?
Anyway, I'm currently grinding out books, and I've got a 10% chance of making a silver star notes from bronze stories, and gold star notes from silver star stories. It's a hell of a grind, though, with a ton of restarts to succeed.