I saw one of these stamps on a letter I received a couple of weeks ago and thought they were magnificent. I am always very careful about the postage that I use. I matters to me what I pay for and what message I'm sending with the stamps I use. Most of the time it's the American Flag... Occasionally, I'll use some Disney stamps on birthday cards... and ALWAYS the Madonna and Child at Christmas.
Mother Teresa said, "Peace begins with a smile." In a small way the presence of her image on my mail may bring a smile to someone's face as it did for mine.