I love them, don't you? I think I've only ever received one and that was over three decades ago. There might have been two, but surely no more than that. And I've just stumbled across a bevy of them. Be still my heart!
I was crawling through my bookmarks and got to Karen Winters' blog. She's the one who directed me to Danny Gregory's blog. Now I have his site bookmarked, but its in an older folder and I don't always get to it. (I'm moving it to my 'favorite blogs' folder today.) And I know gobs and gobs of people already know about Danny's site, but perhaps not everyone, so I'm pointing you in that direction.
On the odd chance that someone might go through my archives here is where you will find Danny's illustrated letters post. He held a "contest" and people from all over the world entered. Just click on "VISIT THE ILLUSTRATED LETTERS HERE" link. They're great!!