Mozna uzyc obu form jako przymiotnika:
"She has blonde hair" albo "She has blond hair."
Blonde bardziej w znaczeniu: blondynka, e.g. She is a blonde.
blond - adjective, male noun
blonde - female noun
the woman is a blonde, because she has blond hair; the man has blond hair too and is, if you insist, a blond
http://www.guardian.co.uk/styleguide/page/0,,184840,00.html