I think hair colour is a great niche as lots of men associate with this...
Amazingly, no one has ever done a permed or straight locks niche. I know most ebony girls have braids of such like, but as a new niche, I do think braids could be a good seller.
Of course, the problem with women, they change their hair like the fxxking wind. Ive always said Natalie is blonde, but now shes going brunette, & lol... it wont be long before she goes blonde again. When its a solo site, its probably best not to mention hair colours