So far only
1) Vesemir (main topic: http://www.nexusmods.com/witcher3/mods/371)
2) Eskel
3) A Clown!
3) Yennefer (tried to add black hairs, but no luck so far)
4) Eredin
5) Letho (with short hair mod )
6) Avallach
Also, Ciri with Yennefer
But I am planning to add a new one every day!
Let me know which one you would like to see next.