Used bookstores are also a source of blank books with fun covers. The most common types are journals (lined pages) and artist's sketchbooks. search for "blank

Used bookstores are also a source of blank books with fun covers. The most common types are journals (lined pages) and artist's sketchbooks. search for "blank journal" or "sketchbook"; or "moleskine" if you're feeling lucky. This one has a cover of a llama <3 -- https://www.secondsale.com/p/black-paper-sketch-book-x-large-llama-sketch-book-with-black-pages-sketchbook-for-use-with-gel-pens-reverse-color-sketchbook/26992317 https://www.secondsale.com/p/black-paper-sketch-book-x-large...