I dont know if this has been posted before but I personally would like markings to look like a Calico cat. I was thinking it could be offered in multiple colors like: Onyx, White, Henna, etc. I was also thinking it could be like the Feline markings in the way that they had different designs (Feline 1,2, 3....). So for example, Calico 1 Onyx or Calico 2 Henna. Each design would cover different sections of the body so you could have multiple Calico colors in different designs to create your own Calico lioness.

This idea was inspired by my kitty Marley. I wanted to create a lioness in her honor but no markings worked together in such a way.

Top image is my cat, bottom image is a random Calico for an example