You may well be able to find "Casablanca" caps at cap_it or dj_capslock, since it is just about the most well-known classic film ever. (I checked the memories at classiccaps, but oddly enough, there was nothing for "Casablanca" there.)

I have not done Laurel and Hardy icons yet, but I'd be interested in doing that sometime. They're cute. *g*

Besides my own favorites, most of the stars I make icons of are the subjects of icontest challenges, either at classicicontest (which I run) or silver_stills. I will quite often do stars I'm not personally interested in at all, if the challenges include a few pictures that I find inspiring.