I am often asked about the handy and well-designed bookplates that I mail to people who have bought my books. I've used 2 designs over the years, both from a company called Antioch. However, you can't order directly from them; you have to find one of their customers, like a bookstore, or you can order online at WallDaddy.
For those who aren't sure exactly what a bookplate is, it's a sticker (with peel-off backing) that you put on the inside of your book, usually on the inside cover. Some people use bookplates to catalogue their private library.
I use them when people buy my books but don't buy directly from me at a book signing. So many readers love to get an author's signature. This is one way to do it. It costs very little to mail a bookplate. I even toss in a bookmark or two.
What I love about the two designs below is that they leave me enough room to add the recipient's name, a special message and my signature.
Here are my favorite designs; you can buy these bookplates online by clicking on each picture:

Or you can browse through the various bookplates at WallDaddy.
~Cheryl Kaye Tardif, author of The River, Divine Intervention and Whale Song
http://www.cherylktardif.com/