Hey! This isn't technically a "creation" per se, as I didn't create it with blocks. Instead, I purposely deleted/created worlds to get this bug to occur, and it has had an awesome effect!
(I also used some seed-mixing to do it, so I had an idea of what biomes would be here and where to find them)
So take a look!
(some pictures taken at night on purpose, some not so much)
Cave Anomalies (so many bats!)
So ya. Really pretty stuff!
I intend to copy and play it survival later, if anyone else is interested in the save, I'll attempt to upload that, too. Also, I'm quite confuzzled now, I'm 90% positive this is the correct forum, but if not, forgive me, but it wasn't very obvious where I should post something like this. It IS technically a creation, I created it myself on purpose, but its not like a building or anything, and its not a seed (doesn't spawn like this without effort).
Also, if anyone is interested in the method I used to make it, I'd be glad to share