I've often wondered about this.. I wear eyeliner every day and am honestly quite sick of it... I know they can tattoo eyeliner on. But what happens if you don't like it? What if I don't want to wear black one day and want brown instead?? I don't know... I suppose eyebrows would be different though. Just hope they do 'em straight!!
The Society of Permanent Cosmetic Professionals has a listing of providers by state if anyone is interested....