I've had so many colours over the years I'd be here all day - blue, orange, yellow, red, white, black, brown, purple, you name it. Actually, one colour I've never had is green hair...either intentionally or accidentally.
^ Well, some peeple like green hair and it can look good, so to each their own. For me it's never been a colour I wanted, and I'm lucky my hair never turned green accidentally. I've seen it many, many times and it's not pretty.
Yes hair often turns green when it is lightened to a level of blonde, and then a dark dye is placed on it without filling in the missing levels first. If the lightening process did occur, you would have to add a red/orange before coloring it brown or black. To deposit the missing pigment.
I have naturally something like Lopez's hair in the attachment, but now I have the color very similat to Dobrev's, just in colder tone. I'm planning on heading back to my original color after 7 years of constant coloring. I even had screaming red hair () thanks to my hair modeling gig with Loreal. Wouldn't go back to that anymore!