- https://app.websitebackgroundmaker.com/
- https://www.toptal.com/designers/subtlepatterns/
- https://patternico.com/
- https://www.humaaans.com/
- https://undraw.co/
- https://thenounproject.com/
- https://illlustrations.co/
- https://drawkit.com/
- https://doodleipsum.com/
- https://www.blackillustrations.com/black-illustration-packs
- https://www.irasutoya.com/ Very Japan-centric, check terms for restrictions
- https://commons.wikimedia.org/wiki/Main_Page
- https://www.nga.gov/open-access-images.html
- https://www.artic.edu/open-access/open-access-images
- Smithsonian
- https://www.metmuseum.org/about-the-met/policies-and-documents/open-access
- https://artgallery.yale.edu/using-images
- https://digitalcollections.nypl.org/
- https://getty.edu/about/whatwedo/opencontent.html
- https://blogs.ntu.edu.sg/openimagecollections/