National Gallery of Art Images
Looking to liven up a presentation with a bit of art?
The National Gallery of Art has created NGA Images, repository of open access digital images. The database includes the 50 most frequently requested pieces from the museum, including works by Monet, Cassat, Renoir, Vermeer and many others.
If fine art isn’t what you’re looking for, the Library also has a list of Image databases which are comprised of or include image files. Many of these files are copyrighted so check what is considered to be fair use for each one.