I don't much like edgy hair colors like blue or pink but a truly attractive person won't be ruined by them.
A good example is Charlotte Sands. I get that the blue hair might not be everyone's thing but anyone whot thinks it actually ruins her has some seriously weird standards:
Emma from Dying Wish although she doesn't always dye her hair pink like the tips here is another example, you may think she looks better with natural hair but regardless:
One look I really do like is natural colors but mixed, like half of hair blonde and the other half brunette like Shawna from War on Women had at Riot Fest... probably difficult to do though.