This is a collection of altered notebooks that I made. This tutorial is for a small one like the yellow and orange in the center of the photo but can easily be adapted to any other spiral notebook.
Trim the edges. I have noticed the notebooks are not necessarily curved the same on both corners.
To tie a simple bow, cut a piece of ribbon or seam binding 3 to 4 times the width of the notebook. I am using the Cherry Cobbler seam binding (So happy they have carried that over into the new catalog.) Lay the ribbon on the front of the notebook, centered over the hole (This is where you see why I like the hole punched in the center of the notebook)
If you try the altered notebook, please post a link so I can see your ideas too.