I touched on selling public domain materials in one of my older posts and also shared generic sources for public domain materials where you can get such contents.
Today, I would like show an example of an specific niche you can focus on which are comic books. There are millions of comic books from the golden age that are now in the public domain and you can get your slice of the multi million dollar comic book industry.
But where can I find those comic books? Well, thanks to the internet and the collective efforts of many, here are my top sites for sourcing public domain comics for resale.
Comic Book +
Digital Comic Museum
If comic books are not your thing, you can use the artwork from the materials to add into products you are developing too.
As usual, it goes without saying that you will need to research copyright and public domain laws in each country that you intend to sell your products to.