I was the Lala in the picture that got Cork Brown from 3x Apples, 3x Berries. Another user on Reddit has confirmed 3x Apples gave them Millioncorn Yellow, while another has posted that 11x Apples has given them Pumpkin Orange.

One thing I can say for sure, though, is that stable condition likely doesn't have a bearing on coloring as my stable was in Poor condition when I did the feeding.