Here are some origami projects from other Hometalk members. You could use old book pages for any of these projects. The could be painted or left to look like the actual pages. There are a lot of various origami project all over the internet so if there is something specific you want, just let us know. Wishing you the best.
Cut the pages into squares and then you can do any oragami! sounds so fun!
maybe this will help
This is my favorite book page idea. I use it as an organizer and to hold Christmas cards. https://www.homeroad.net/2014/12/folded-book-christmas-card-display.html