My Mom was a postcard collector, and whenever she ran across one that had a rocket or a plane on it, she brought it home (if it wasn't too expensive). As a result, I have a fairly extensive collection of some rather rare photos. Postcards typically use a color dot printing process, so they generally scan fairly well at low resolutions.
I've tried to arrange these cronologically, and where they're identified as a particular flight, I've linked to the entry in Mark Wade's Encyclopedia Astronautica. If you have a slow connection, hover over the thumbnail and the ALT tag will display the size of the target image.