Not sure if anyone's posted a Pumpkin Orange ref yet, but I got one from 11 Apples, 8 Berries, and 7 Pears. I fed him one of each fruit, in that order, and just repeated the pattern until all the fruits were exhausted. This method got me from Desert Yellow to Pumpkin Orange on the first go.
For anyone here who may still be deciding on what color they want, know that the screenie below has not been color-altered in any way, so it's as good an indicator as any of how your end product will look. The only editing it got was a mild Diffuse Glow filter (I'm just partial to it on my XIV screenies
), and I took care to keep said glow away from the plumage so you could get a good look at the coloring. I know I had a hard time deciding if I wanted this color, because I couldn't find any reference screenies for this shade and it's one of those colors that can vary a lot with what you see it on, so you just gotta see it on the chocobo itself. Hope this helps! 
(sorry about the small thumbnail - I wanted to give y'all a close-up)
For anyone here who may still be deciding on what color they want, know that the screenie below has not been color-altered in any way, so it's as good an indicator as any of how your end product will look. The only editing it got was a mild Diffuse Glow filter (I'm just partial to it on my XIV screenies
), and I took care to keep said glow away from the plumage so you could get a good look at the coloring. I know I had a hard time deciding if I wanted this color, because I couldn't find any reference screenies for this shade and it's one of those colors that can vary a lot with what you see it on, so you just gotta see it on the chocobo itself. Hope this helps! (sorry about the small thumbnail - I wanted to give y'all a close-up)
"I'll be fine! Give up? Me? Absolutely not!"
