Mob skin and size variants

Its sad that Minecraft mobs are the same size (accept babies) and mostly the same texture . I suggest each mob has atleast 5-15 variants , heres and example for cows: Highland  , light brown , buttercup , black and white , Bronze etc. . And I also suggest mobs should have size variants , about 4 different sizes baby , medium , average and large. With 4 sizes and 5-15 skin variants it equals = 4 + 5-15 = 20 - 60 variants for each mob! I suggest this in your next update .