Different caves in the pale garden

Recently, a new biome called Pale Garden has been introduced to Minecraft, but even though it has a new biome with a new wood variant and also a new hostile mob, It doesn't seem very complete, it seems to be missing things to really make it "interesting". That's why I think that in addition to having the top part completely pale, we should also have different caves within the biome. Concept: When we enter a cave within the biome I would like there to be some roots invading the walls and top of the cave, as if trees were invading the ground. Making it so that the creaking or a variant of this mob for the caves can also appear in the caves (because I also think that the glowing eyes of the creaking would look much better in the darkness of the caves). Well, this is my idea for a cave. I also think that this could give this new biome a differentiator, and also give the opportunity to be able to find the biome while in a cave. Also providing an extra challenge in the caves.