There are a ton of videos promoting creation of low content/no content books and how you can profit with coloring pages and journal alike books.
What do you think?
I have a gig on this, just in case.
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Yes, custom colour books would be a good idea though.
Allow buyers to upload personal pictures (family pictures, pictures of pets etc), use a AI software to turn the picture into a “colouring in version”.
Sell on Etsy. Goldmine.
You can make money from anything.