The British Library recently added more than one million images from more than 65,000 public domain books published in the 17–19th centuries to its Flickr Commons page with a CC0 license to encourage users to remix, reuse, and repurpose the images. Included in the million images are geological diagrams, illustrations, comics, illuminations, landscapes, paintings, and more.
The images on Flickr have a set of descriptive tags to help identify the works, including the year of publication, the book record number, and author. Plans for a crowd sourcing project to add more robust descriptive information about the images are in the works for next year.
Check out the British Library Flickr Commons!