Inverse Worlds
Where there is normally air, blocks generate. Where there are normally blocks, air generates.
Looking at what would be a noodle cave connecting to a cheese cave, except it is a spindly chunk of land over the water
Image from below the water, where features deep in the world float over an endless pool of magma. It's pretty cool how the water above seems to mostly form a big aquifer
Image from inside the wall via spectator mode, showing the shape of these caves
Underwater screenshot, but with the fog removed via mods, exposing the strange convolutions of this inverted worldgen
From the top of a "mountain," looking down at twisting "caves" of land
Screenshot of the Nether that looks incredibly normal
Screenshot of the Nether, showing how it has an easily accessible "top" now
Screenshot of the central end island, showing it is now more of a central end cavity.
Screenshot of the top of the end, where the dragon and return portal sit alone on a vast plane of endstone
End city atop a featureless plane of endstone, alongside a few chorus trees
There are still big cavities in the end, where you would expect islands to be. Not my fault there aren't very many blocks here so it's mostly just a slab of endstone though