The items in this set are my first try on a graveyard setting. I used them for a RPGMaker MV test. The tileset should work fine and is to some extent able to expand. At least I kind of find this set already useful. It comes also with a bunch of stuff you can put into the scene. You need something like a graveyard setting. This could be everything you've searched for. 

It also works great with the naturals 01 and 03 that I've tried to create stylistically appropriate and match up.