Changing An NPCs Skin Color (Ex: Like Tan > Purple Ogre)

[Zoldam]

There are a few unused skin colors that you can see in the model viewer, I was wondering if this could be applied to custom NPCs/or alter the current NPC skin color. An example I will use is I wanted to make a custom Felblood Elf using the unused female caster skin color (Purple robes), the game only used the white and red robed ones and the purple is in the files but unused. Is there any sort of way I can use it? Forgive me if this would go in model editing, but it IS about a private server issue.