Old books are very plentiful at yard sales. You could glue them to the left over cover and hang it on the wall as a collage. or if it has a fabric cover, cut in from the back side with an exacto knife. Then it would fold into an "L" and then could be like book ends done up with it's own pages into a bouquet. Just ideas :)
Thinking Etsy ....
Wow. nice i will try to do that cool.