If you have never looked at Raw Pixel, it might be a fun exercise. There are so many free-to-use goodies on there and the search engine is pretty good. I love that you can isolate free to use or public domain items with ease. The link should take you to a vintage selection, just as a starting point.
I had an explore and a play and made four envelopes you can download and print, in very different styles:
Now, I think you could grab the images by clicking them to expand them to their full size and then download them but I have there here as PDFs, if you prefer:
If you use images for junk journals or cards or art journals or any sort of art, of you make KDP journals and books, or even if you just want to print a bit of art for your walls, Raw Pixel is a great place to find high-quality images.
Hopefully normal service will resume next week!