Right now, pigs, chickens, and butterflies are all the same colors. This means that if I have two pigs and five chickens and three butterflies (and I do), I can't tell them apart - it's especially tricky with the butterflies and the pigs because harvesting from them is a two-step process and I have to grab the same one. What if, in addition to being able to rename animals with the right skill, you could recolor them? Pigs have a base color, a spot color, and trotters; chickens have a base color, and tail/wing markings, and comb/beak/feet; butterflies have a gradient from one color to another and wing edge markings. Even if that would be too complicated and there were just a handful of stock palettes to choose from it would be neat. You could also turn it into an item, maybe, if it needed to be more difficult to do for some reason - "pig paint" or whatever.