If you mean a fake vanilla-looking cave, then just go caving while looking at how they generate. Look at the indentations on the walls, look at the odd imperfections, notice how unnecessarily frequent every stone except stone spawns, etc.
Rollback Post to RevisionRollBack
Well, the forums aren't dying, and neither is my map series on Java.
Check this thread for details or click this link to join the maps' Discord server (the join link is permanent and I am online daily, despite what random post you found this on in 2015).