Back in the early 90's there were a series of books by Nick Bantock about a fictitious couple called Griffin & Sabine. They were beautifully illustrated, and the story was made up of postcards and letters. For the letters, an envelope was adhered to the book page with a letter inside.
I was enamored with the stories and the look and feel of the books, and for the past three years I've wanted to do something similar. Recently I did just that. On the right side of each page is a calendar, along with a flower and it's description. On the left side is a space for a postcard or an envelope with a letter inside.
This was a gift to my mother. Each post card and letter were personal snippets of my life - something I knew my mother would appreciate.
Here's a link to the book page on my web site: http://pmgraphicsanddesign.com/books-and-catalogs.html