Here's my third attempt at making a tile.
I call it "Tomb of the Ghost Slayer"
I really liked the "escape effects" ghostly appearance and had a a wooden structure over the top, but you couldn't see the cave! It had to go.
I tried going for something like: one culture wanted to tomb this guy in, another revered him so much they made a shrine out of his tomb. The ghostly corpse still emits power enough to enshroud the surrounding area with "fog."
The effects really slowed down my meager computer, but once again, and unlike my second attempt, it was a blast to make.