What you need:
Square pieces of paper [for the above book I used 10]
2 square pieces of card that are cut to the size of your folded paper
and Cello tape
Step 1: Fold a square piece of paper in half on both sides. Unfold. Turn the piece of paper over so that you can see the back of the previous folds and fold diagonally once. Unfold. Turn over.
Step 2: hold the paper so that the diagonal fold is horizontal and the bottom point is towards you. Next squish in the to horizontal points so that it looks like the above and squash it down into a square. Yes I know my instructions are not so good so you can follow the instructions here. You need to fold all your square papers as above.
Step 3: Cut out two pieces of card that are a few millimetres bigger than your folded paper squares. You can cover the card with wrapping paper on one side.
Step 4: Using Cello tape stick the string to the card as above so that it runs through each piece of card [corner to corner] and leave about 4 inches on either side.
Step 5: Stick a folded square to the card so that the open corner is lined up to the corner with the string.
Step 6: Stick your other squares on top, making sure that they all open up in the same direction. Once you have stuck down all your squares, stick the second piece of card on top.
In the background of the picture above you can see all the squares that have been folded. This book was actually made by one of my 9 year old students.
The strings are to hang the book as decoration or to tie the book closed. You can open each page in the book and write in it, then fold it closed again.
I know this tutorial isn't all that great and I'm not sure whether its actually clear enough to follow. If your finding it difficult leave me a comment and I'll answer it.