I was typing one of my Journals, and suddenly remembered that Uluri can canonically split, so I can add in some beautiful Uluri Character Lore that fits in so Nice to have Blue and Green. We liked that Idea.
A Slime that separated into two. They look almost the same, but aren't the same exact slime anymore.
Yay.
Fun Fact: Green Uluri's colors have been changed once so that it looked nicer for a certain type of color blindness. The colors used to be too close in hue and looked solid in color, so I changed it to be easier to distinguish the markings. This is also why I outline markings when I draw, too.