They're not all ginger you know...
When Color (as our American friends spell it) came into the movies redheads came into their own. The vibrancy of hair and skin contrast were made for the medium. Even now there is a 'stand out' factor with redheads on screen.
Sheridan & Hendricks
Roberts & Ross
Flintstone & O'Harra
Fleming & Moore
Margaret & Ball
Welch & Rabbitt
Classic Red Rita