I have done a few unnatural colors for fun. In high school I accidentally ended up with flamingo pink tips once in a fiasco that involved blonde tips and some plum colorwash. I dig bold colors in hair though
I used to change my hair color every week back in high school, I've had blood red, blue tips, pink streaks, red streaks, blue and green streaks lol I've tried a lot of colors.
i had for a while had the underside of my hair dyed blue (fish bowl blue by special effects) but it fadded to a yellowy green way to fast so i got rid of it quite a long time ago.