Most Helpful Guy
I personally don't like it when girls dye their hair. However, it can look good in moderation. For example, there is one girl I know with long, straight, black hair (she's Asian), but she dyes the last 3-4 inches of her hair bright purple. I personally think that looks nice, but if she dyed her entire hair that color, it'd look trashy.
I personally like darker hair. The darker the better, for me. It's a bit disappointing to me when I see girls with dark hair dye it blonde, especially if they're Asian, Black, Latina, etc. (sorry, but non-White blonde people look really weird, in my opinion...).
At the end of the day, it's really your choice. Dyeing your hair doesn't hurt anyone, so dye to your heart's content.
Most Helpful Girl
I've had hot pink and bright purple hair before. I did it because I wanted to and I didn't care what impression people had of me. I actually got a lot more compliments than I thought I would.