I have an idea I would like to share.
Recently I often see marking recolor sugestions - markings we already have in different colors we also already have.
What if, for example, White Marozi and Onyx Marozi would not be a completly different markings? There will be Marozi (White) and Marozi (Onyx). When you breed lions - one with Marozi (White) and second with Marozi (Onyx) in the same slot, you'll have the same passing chance (or a little lower so it would be fair) as now with breeding White Marozi with White Marozi in the same slot, and 50% chance for White or Onyx color. For more exclusive colors like Ice, Lilac etc. % for this color will be much lower.
That would be a little easier to find a good lion to breed with, also that would allow us to give our lions markings in color we WANT, not in color that is popular/easy to find in kings (some are omitted because we can rarely find such a stud, for example markings in colors Black, Brown, Mahogany), and I think that this in some way would facilitate the introduction of other colors for existing markings.