we have many mutations with hybrids, lethals, primals, ect. all of the current mutations mainly alter the physical build of the lion, e.i no eyes, two tails, fused limbs, looking like a saber tooth, ect. but none of them except albinism, melanism, and piebald only alter the actual appearance of the lion. in real animals, appearance mutations are common, like how a black and white dog could have pups with a brown dog, something goes wrong with how melanin colors the fur and a pup could be born with say, gray and cream fur. it technically is a mutation, so why not add something similar to lioden?
where there is a small chance for a cub to be born that has a different base, markings, ect. from its parents, obviously having rare bases and markings in a mutation like this may or may not be worth it, thats up for others to deside, that way we can get a bit more of a complex appearance possibilities in each pride, instead of having to always the same basic genes appearing generation after generation.
if this has been suggested before, i apologize, i searched but found nothing like this, there may be one out there but i couldnt find something quite like what im suggesting here.