I can't take credit for this idea. A fellow book-loving-maniac showed me hers and I copied it with only minor changes.
We covered the characters in the book with pictures of ourselves and wrote all kinds of lovey-dovey messages in it. Then, we gave it to Daddy, followed by a candlelit dinner.
I know there are lots of mushy books out there you could use. This book, You and Me by Martine Kindermans, works well because the simple color scheme is used throughout the book.
It was a fun project. Bubs and Welly didn't even realize they were practicing their writing and spelling. ;)