Do you have pics? How long did the color last? I think they'd look cool, but the idea of getting dye/ food coloring / chalk (or whatever substance) all over the place prevents me from trying. I have enough problems staying clean when coloring Easter eggs - and they don't move. I'd hate to see what I would look like after playing with permanent dyes. I'll have to experience it via pics from others.I dyed my showgirl once, she she was in a Fort Knox pen and was kept safe.
The tossing & coloring of baby chicks looks traumatic. I'm sure a loving chicken owner would simply brush or massage the color into the feathers.