Your tutorial is fantastic! It was very easy to follow. I've been wanting to cover my daughter's school agenda, so after I found this tutorial, I stopped at Walmart and bought a 4 pack of fat quarters, and made the cover this evening. I found I ended up making it a bit too small, even after taking measurements (must have sewed farther than the 1/4 inch), but I just cut down the journal's front and back cover to make it fit. I also used the same fabric that was on the outside to make the button loop and pencil holder (she's not allowed to use a pen yet). Oh yeah, and I machine embroidered the label and fused it on the front. My daughter loves it, and so do I! Thanks so much for sharing this tutorial!
Added: By the way, this is a spiral book, and I had no problems! I made another agenda cover for my son, included the photo below. Fabric and button from Walmart, readjusted the measurements by 1/2" and it fit perfectly.
Front and inside of my son's agenda cover