Go on to the Avatar Editor and go on features, then put the Green box around the hair icon (but don't click on it).

Hold down left trigger and wait about 2 minutes until the hair icon spins. When you click on the hair icon it will do a special tune and then your Avatar will come up with pink hair.

Choose your style then choose a color and it will come up with the following colours: purple, red, burgundy, pink, light green, dark green, dark blue, light blue and more.