I chose to use one of the book panels and border it with a white print and then the book prints around that. When I quilted it, it became wonky, but I still love it. I still have some scraps and 5 more book covers to do something with.
You can really see the wonkiness on the back. At the beginning it was straight, I promise.
I am so into the toile print from inside the covers of the books. I should get more if I can find it.