So it was more than likely actually the Tails mod you're referring to here, Tail is open source and always has been as far I can tell. Meaning it's relatively easy to just make some custom parts not shipped with the default or factory version of the mod. (Hint hint)
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"If you don't understand the bigger picture, writitng a program is difficult. That's true with any computer programming language, not just java. If you're typing code without knowing what it's about, and the code doesn't do exactly what you want it to do, then your just plain stuck." - Dr Burd
Owner/Admin of the amazing and awesome super custom modded Ninjacat Server!
(This no longer applies, due to rudeness and spam we decided to work in private)
I'm not sure as of yet where i will upload the mod, i'll see what i can do with any animations (i still need to include the meif'wa tails in all) and as of now i'll check out potentially colour changing but nothing is promised (though you could probably go through the files and recolour it).
as mr curse developer person said, you can add 3d models to the tails mod, but theirs also a mod called more player models that i believe Aphmau uses for her 3D models. If you don't believe me, look through her old lifestreams and somewhere near the end she tries on a sea bunny model, the screen shows the more player models character screen.Therefore, she at least uses it for entity models, which would make sense if she uses it for parts, too.