My wallpaper collection is sorely lacking right now, but have an old classic. This guy did some pretty great stuff, including a few spooky ones.
If you're interested:
I have a few mobile wallpapers I'll share. Mostly movie posters without the text, but all horror movies so it's at least tangentially /x/ related.
3 (I think I have a version of this without the text somewhere.)
5 the next few are some kind of fan made mobile wallpapers for The Last of Us. Found em somewhere and don't know the artist.
I have more desolate, empty nature pics which are kind of creepy but more pretty