For the recently deceased of course... Ghosts, creepy trees, odd mist. That kind of stuff.
I'm kidding obviously, but the graves would be a nice implementation, as i have 3 corpses outside my location, and they cause -100 happiness. I'm too lazy to build a boat for these saps, so i dragged them far out. They're not coming back, so their bodies are useless to me... Or are they...?