Slime biome and altitude variation

So, slime chunks can be anywhere in the Overworld, so my thought is that Slimes can have slight opacity and color variation depending on where they are in the world. Maybe slimes could be more opaque the higher they are in the world, indicating they're heavier, and maybe they could have paler, thinner slime the further down you go. Even then, you could also do slight tints for the different biomes, like foliage.