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fun_caves
Fun Caves started as an attempt to convert the mapgen V6 caves into a lua mod, so they could be used with any mapgen. However, I've since turned it into an all cave environment, with no surface at all.
Players spawn into a massive cave, hopefully in an area with mushrooms, and start digging. Dig up, dig down, dig sideways, you'll never find a surface world -- no trees, no flowers, not cows and horses. What you will find are fungi, algae, monsters, and lots and lots of goblins. Every ore is available, everywhere, which means there's a lot of it.
Hint: Find some giant mushrooms, first thing. They're handy.
The source is available on github.
Code: LGPL2, textures: CC-BY-SA and CC0
Mod dependencies: default, flowers, wool
Download: https://github.com/duane-r/fun_caves/archive/master.zip