As you most likely did not know, I've been running (is that the word?) another website until just recently. It was a bore, which was one reason I stopped publishing it. Anyhow, there were quite a few "photo of the day" posts there, so to save time (mine and yours) I'll put them here.
Anyway, that's the one that made me a fan. After that, I bought Carefree, which has Ginger paired with Fred Astraire. It's not one of their most musical movies--it has only three or four songs--but it's pretty terrific to see Ginger chasing Fred for a change.
*Honorable mentions go to The Major and the Minor, with Ray Milland, and Bachelor Mother, a neat little comedy co-starring David Niven.
For non-fans (that is, non-fans as of right now), try Romance on the High Seas. She plays a club singer and does a great job...not a normal role for her, as this character's a bit more, let's say, willing, than most of hers. If you're not much for musicals....get out of here. Or, try Alfred Hitchcock's The Man Who Knew Too Much. But make sure it's the later version, otherwise you're liable to hate me. And we wouldn't want that.
Leslie Caron's always great with character, making each one she plays her very own. Father Goose and Fanny are two more of hers I'd recommend.
Annnd...Joan Crawford's nice too. :)
Really, check out A Woman's Face and Mildred Pierce. I never really got into Joan Crawford until just recently...I'd preferred Bette Davis all my life (and still do), but Joan has some great parts as well. Sad that she's known mainly for...oh, you know.