The results are in, and the post card project was a BIG success! Yippee!!!
One post card did get lost in the mail. I'm really sad about that, not because it made the project incomplete or anything, but because it was a nephew's who was the very first to respond to me with a nice email "It is so cool! What an awesome project," and he was the first one that mailed his off to the recipient. I'm hoping that it will eventually work its way through the postal system and arrive at its destination.
I had a lovely phone conversation with my mother-in-law on her birthday that validated all the effort. And then yesterday I received an email from her including words like 'thank you' and 'given me so much joy' and may or may not have even mentioned something about me being the favorite. :)