Looked it up, and albinism and melanistic pumas exist.I don't think it's really confirmed but if I remember correctly there are some People that claim to have seen black Mountain Lions (but might've also just been escaped Leopards or Jaguars)
But here's something I think I'll actually prefer: some pumas apparently don't lose their spots as they age. They get kinda faded, but they're still there.
Here are 2 (horrible) images I found:
I would love a spotted puma. Wouldn't y'all?
Now another question: should different species have multiple color mutations? Or is there some coding issue why we can't?