Colouring Custom Textures based on Biome Grass Colour

The idea is simple:

You want to create something, like a block, plant or item (basically anything with a texture) that changes colour based on the Biome Colour (which is typically a type of green).

This is how you'll be able to do it:

Step 1: You create 2 textures. The first texture (Standard texture) is the texture that is displayed at a static colour in your inventory and the second texture (Mapping texture) is a black-white texture in which all pixels that you want to change the colour from are marked in black:

When creating your texture, you'll simply have the option to apply a "map" texture and boom! your colour changing texture based on biome is finished. The END.

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Whenever the mapping image is inserted, it will ignore all pixels that aren't of RBG value 0,0,0. Based on every black pixel, it will (based on the alpha either completely or completely not) greyscale the pixels from the Standard texture. It then looks at the RBG value for grass of that biome and recolour that texture based on the biome colour.