I used half of a pad of mini post-it notes. The measurements can be adjusted depending on what size and the amount of post-it notes you use. Starting with a 5" x 2 1/4" piece of chocolate chip card stock, score the card stock at 1 1/2", 1 3/4", 3 5/16" and 3 9/16". Yes, the 16th's of an inch matters. I tried using more standard measurements, but the post-it note pad just didn't fit right. You really want it to fit snugly in the book.
So, once you've scored, then you fold it up like a book with the shorter of the 2 flaps on the outside. Like this:
If you'd like, punch the 2 outside corners with the Corner Rounder Punch. Add extra adhesive on the post-it note pad before attaching it inside the book so it won't go anywhere. To get the Velcro lined up just right, put the 2 sides together and attach the rough side to the flap. Then remove the backing for the other side and simply close the flap and press firmly to adhere in place.
I decorated the cover by cutting a piece of designer series paper to the size of the outside flap--about 1 3/8" x 2 1/4". BTW, I used the Sweet Pea paper from the Occasions Mini on this project, which is no longer available. The bunny is from the Forest Friends stamp set. He's punched out using the large oval punch and layered with a Scallop Oval.
These make wonderful little gifts and are a great way to use up some of your scraps. Be aware, once you start making them, they will multiply like rabbits!