This little trick is not so secret, as it’s been going around the internet, but it’s not immediately obvious and it took me a few tries to do it because of some false information out there, so I thought I’d post it. There is a way to unlock wacky color hairstyles in the avatar creation area of the New Xbox Experience.  I found this video that explains the process:

Some people are saying to spin the right stick, which doesn’t do anything.  I hit the green button to go into the hairstyles area right when the icon spun, and they were there, but some people say you don’t even need to do that.  At any rate, try it out!