The Van Gogh Museum has digitalised and made available for download 986 of his paintings for non-commercial use! And there's contact information if you'd like to use it for commercial projects. A PDF with terms and conditions can be downloaded if you click the download button on a painting.
There's also a bunch of his sketchbooks, and I'm happy to see that even van Gogh had a bunch of random empty pages in his sketchbooks
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