The Getty Museum has made its digital collection freely available, according to The Getty Makes Nearly 88,000 Art Images Free to Use However You Like. This announcement rightly notes that the Getty’s free content is not new; they opened their content first in 2013.
From Getty:
The Open Content Program makes high-resolution images of public domain artwork from the Getty collections freely available, without restrictions, to advance the research, teaching, and practice of art and art history.
Some uses for the work in their collection are as a screen saver (computer and phone), flyer, advertisement, needlework pattern. . . the list is endless.
Image: Digital images courtesy of Getty’s Open Content Program. Photo on the left cropped.