one of the best features that I think was dropped from don't starve in all of it's life I think was the cave walls. The cave walls for those who don't know were a feature that was in while the caves were in beta, and were just that.
This is what the cave walls looked like when they were first introduced. Later on they got touched up a bit before being ultimately removed. Of course, the cave walls during this point didn't look very good, but as far as i'm concerned it was the first few steps into the caves, actually feeling like they were caves. The caves as of now as you all know just sorta have endless voids in places of what is impassable territory. this doesn't feel to me like anything close to a cave. I think cave walls, implemented in a more developed way (smoothened edges, better way to show where you are aside from just a small circle around you, more textures that make the transition from ground to wall more natural, stuff like that.
I definitely think that Cave walls have the capability to look good and enhance the experience of being in caves, by virtue of it theoretically making the player feel more like they're in a cave instead of a dark realm with mushrooms.