making colour-mapped textures

with the ability to make custom trees using various methods, I thought it would be quite cool if you were able to make textures that change colour with the biomes, like leaves and grass in vanilla Minecraft.
because currently you could make a tree with green leaves, but it would always remain the same kind of green.
and a more technical thingy, blocks with layered textures, so that you can make blocks like grass that have a normal texture with a colorizing part on top of it.
if this feature were ever to be implemented, I would be very happy, but I also understand it might just be a bit too technical and confusing to add to Mcreator.