Ok, I've just had a chance to do this. In order for you to change the colour, you need to change not only the "wings", but each row of feathers too. In the menu below the window, pick "Body", and then in the Material area, change the colour for each thing in the drop down menu. I had no problem changing the wings from white to shocking pink.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi