I collect vintage cards whenever I can find them, and I do use them, as well. It's always best when you are lucky enough to find them in a box!
Here are a few that I haven't shown you before - pansies:
A wishing well - reminds me of Snow White! "I'm wishing, I'm wishing... for the one I love..."
A lovely open window:
More gorgeous pansies:
The sweetest little lamb:
And a beautiful floral arrangement:
They're perfect for storing things in, too - after the cards are gone.