Several years ago, I set up a postcard site for my BookCrossing friends. Some of the cards were designed by BC members, and some came from my graphics programs. Some are general purpose and some have Ballycumber, our traveling book mascot.
I searched high and low for a postcard site that I trusted until I found one. The postcards are free to use, and I don't make a penny off of them. I guess the host site, Dear Webby, makes something, but that seems like a fair trade. In the several years I've done this, there has never been a complaint or a problem reported to me.
All of that is by way of saying that my new blogging friends are welcome to use the site. We have birthday, get well, thinking of you, and right now, Fall/Halloween/Thanksgiving cards. There is even a Thanksgiving card with a maple leaf for my Canadian friends. At the bottom of most categories, you will see a little book animation. Click on that to see the second page of cards for that category.
I hope that you enjoy them!