So I was reading up on every ones ideas on how this chocobo color change works and decided to tinker with it myself. I have been trying to apply the math to others found colors and what they are reporting they used. From what I am figuring out seems pretty close, but I am sure I am missing / overlooking a variable or two. I have been using Paints custom colors to try the figures out in and the colors come very close to matching.

Red = 255 / 85 = 3
Green = 255 / 85 = 3
Blue = 255/ 85 = 3

So 3 Fruit = 255 of one color
2 Fruit = 170
1 Fruit = 85

So you have Lighten fruit which would mean -85 and darken fruit which would mean + 85

That being said if you where to use a (lightens blue = -85 blue) on your desert yellow chocobo you would get a honey yellow chocobo.
Honey Yellow = Red 255 Green 255 Blue 0.

If you where to use a (lightens red = -85 red) you would get a shade of green.
Anyway I need more feedback to prove or disprove my theory. [Please assist.]