Joan Bennett, Lucille Ball, Mary Brian (with James Cagney), Myrna Loy, Vivien Leigh (as Blanche Dubois in "A Streeetcar Named Desire" by Elia Kazan), Anna Karina, Brigitte Bardot, Catherine Deneuve, Constance Bennett, Marilyn Monroe, Lana Turner, Rita Hayworth.
Blonde / Brune (Actresses changing their usual hair colour) :
http://dsata.blogspot.com/2010/11/brune-blonde-actresses-changing-their.html