Lol, and again this a belated post. Anyway, interesting question. These are some dream teams (imagine all them looking young):
Cary Grant & Olivia de Havilland: In a romantic comedy.
Audrey Hepburn & Paul Newman: In some heavy drama. Really.
Carole Lombard & Rosalind Russell: I'm sure I wouldn't be able to stop laughing.
Marlene Dietrich & William Holden: In a comedy taking place in a cruise.
Gary Cooper & Ginger Rogers: In a western with a good dose of humor.
Lauren Bacall & Burt Lancaster: In film noir of course.
Rita Hayworth & Richard Burton: In some romantic drama.
Claudette Colbert & William Powell: Obviously, in a witty comedy.
Grace Kelly & Robert Mitchum: In a thriller.
Errol Flynn & Jean Arthur: In some light comedy happening in exotic places.
Deborah Kerr & Laurence Olivier: In a war movie.
Gregory Peck & Vivien Leigh: In an epic movie.
What do you think my dear readers?