More free art for reuse

Amsterdam’s Rijksmuseum has put over 700,000 digitised copies of its huge art collection online, and is making them available to reuse as public domain

Source: Over 700,000 paintings from the Rijksmuseum online copyright free

You need to create an account to download the high resolution jpgs, but without an account you can still right-click – save image as to download a pretty decent quality image. The English site is available here, but it switches to Danish if you try to download an image, so be prepared for that.