If you love the idea of book art, but find it daunting to figure out how to design a certain image, you could actually buy patterns for it. LoveBookFolding on Etsy sells digital patterns so you can turn your own old books into pieces of art!
There are a bunch of owls available, as well as plenty of other animals and designs to cut and/or fold. The shop owner is even willing to do custom work, should you have something else in mind or want something personalized.
If book folding is something you want to learn more about, be sure to also visit the Love Book Folding website as it has much more info and even some tutorials!