Take for example this item...
It's a 1952 Star Cal decal made by the Meyercord Company of Chicago. (Note: the above is a scan of my decal, the rest of these images, except those of the back of it, were found on the net. I'm sure I set a personal record for using 'borrowed' images in a post but I did it in the interest of research).
Meyercord manufactured decals of all sorts and many of the designs may look familiar.
These are pretty typical:
And they were used by crafty types on all sorts of everyday items:
And as part of a kids' craft book.
And in their catalog....
you might find some of this....
...that (ahem) ended up on things like this:
Finally some odds and ends that accumulated on my desktop while googling these things:
I found a vintage picture of a 'Meyercord Decal Shop'. Could be a kiosk set up in a department store. Hard to say for sure.
Finally if you are curious here is the the back of my Star Cal Pierce/Fox.