From my own collection of vintage postcards. I collect paper ephemera and these are from various sources.
HOWEVER - I do not want them repackaged and sold on somewhere else. That's not fair. Also don't just plonk one down on a background and sell them on, again, that's not fair considering the work I've put into them.
When I say commercial use, I mean you can add them to a piece of art, website, leaflet, poster etc. or they can be added to cards, atcs, aceos, collages, scrapbooking etc. but NOT to be sold on as an element by themselves.