Why do Elezens not get blue hair?

As minor as this sounds, why don't they? What is the reason? All the other races do.

http://images.mmorpg.com/images/news...XIV%20Hair.jpg

Which color am I talking about?

These,
All races besides Elezen Get Blue shades in this slot, but elezen instead gets purple.
http://img2.finalfantasyxiv.com/acci...5305b103ca.png

I've been using the purple shade without knowing because i'm colorblind with shades and I've only just found out it was purple due to someone else pointing it out. I'm not upset, it just bothers me somewhat.

I wanna dye it blue to have it some what matching with my glamor style.
http://img2.finalfantasyxiv.com/acci...7662727706.jpg

I know it won't happen, But what is the reason for elezen having a different set of colors for their hair?