I'm a huge classic movie fan, so here we go...
Animal Crackers - Marx Brothers
Duck Soup - Marx Brothers
The Thin Man - William Powell & Myrna Loy
The Ox-Bow Incident - Henry Fonda
My Man Godfrey - Powell
Mutiny On The Bounty - Charles Laughton
Born Yesterday - Judy Holliday
Murder My Sweet - Dick Powell
Anatomy Of A Murder - James Stewart
Witness For The Prosecution - Laughton & Marlene Dietrich
Sunset Boulevard - William Holden & Gloria Swanson
12 Angry Men - Fonda
To Kill A Mockingbird - Gregory Peck
The Maltese Falcon - Humphrey Bogart
On The Waterfront - Marlon Brando
Double Indemnity - Fred MacMurray & Barbara Stanwyck
Strangers On A Train - Farley Granger & Robert Walker
Ball Of Fire - Gary Cooper & Barbara Stanwyck
yyahoo: I'm pretty sure "The Birds" was in color.
Licurg: Huh ? You sure? Because I definitely remember seeing it in black-and-white.
{shrug} I own it on DVD (I'm only missing a few Hitchcock movies in my collection - still haven't bought the Criterion releases of The Lady Vanishes or 39 Steps, they're always so darn expensive). It's definitely in color. I just checked IMDB, and it states that it was originally in color (Technicolor).