A Single-signature Card Book
This is a very simple way to create a beautiful little book with a matching envelope. Just purchase a blank card with a pretty picture or design. Cut enough pages to create a single signature to fit inside the card.
Then poke holes through the pages and cover and sew using one of the single-signature sewing patterns. Here I used a colored crochet thread to sew with, but narrow ribbons or fancy yarns would also work.