Instructions
Sign in to your Xbox profile.
Go to the "My Xbox" area of the Dashboard menu.
Scroll right and select your gamertag.
Choose "Customize Avatar." The avatar customization application opens.
Choose "Change My Features."
Choose "Hairstyles."
Choose a hairstyle from the list. A list of hair colors appears after you choose your hairstyle.
Select a hair color.
Press "B" to go back to the avatar customization main menu.
Select "Save and Exit."