Vintage Greeting Cards with Floral Designs

One of my favorite things to find at estate sales, is a colorful old greeting card.   

Floral designs were popular in the post-World War II era. 

Here are some examples of cards I found at yesterday's estate sale.

Irises and daisies.

A single yellow rose.

(How did Mary and her Little Lamb get in there? And why?)

Pansies.