I was considering creating a new dragon skin, so i was studying the picture of the piebald dragon when i realised that two talons on the front claw and one talon on the second claw weren't coloured in the same as the other talons (they're not coloured in at all, actually). This is the same for all piebald dragons, but not dragons of a solid colour or with stripes. I have attached pictures.

Leila

This is a piebald dragon. It is missing pigment on the different parts of its body, including talons and spikes depending on the leucistic pattern. It is not restricted to coloring of the scales only.

http://en.wikipedia.org/wiki/Leucism