everyone experiments with their hair. its fun and i mean come on. its just hair. if it looks so incredibly bad, just make the stylist tone it to a color you like. Plus it will grow out. I'd suggest try highlights first.
I have medium brown hair that becomes reddish in summer with white blonde highlights. I've been dyeing and highlighting since highschool. I get highlights every five weeks that help keep my summertime look, and as soon as summer hits, no more salon except for trims for me. I've been auburn, brunette, blonde blonde and everything in between. My hair recovers after a few days and is normal again.
If you hair is thin, you might want to be careful and make wise choices because it can tend to be brittle. Also, try subtle highlights then add more if it isn't what you want.