While the above post cards are in the public domain, the following two vintage cards are mid-20th century and may or may not be still under copyright. I'm posting them for enjoyment and inspiration.
If you don't know how to get these images onto your computer:
Windows OS users: left click on the image and choose "Save image as ...", change the file name to something that makes sense to you and then save it your chosen file saving place.
Apple OS users: hold the Control key while clicking on the image and choose "Save image as ...", change file name and save to chosen file.