One set of them are these Singer Sewing Machine National Costumes cards.
A few years ago, I scanned a dozen of them at high quality, and offer them as free printables on my site here.
You can use them (for personal use only) as pictures to decorate your sewing area, or print them onto fabric, and incorporate it in a quilt!
I do have more cards with other countries, but just haven't had the free time to add more to the set.
Perhaps in the future.
I'd love to hear how you use them!