Occasionally, really cool things happen in this world... such as the Met making its images all open access. That means 375,000 images of public domain works to share, remix, or use in any way you want to, under a Creative Commons Zero license.
This is wonderful!
You can go
read more about the open access here, and
here is the starting page for image and data resources so you can go have a rootle. They also have an extensive list of publications that are available online and for free, and
you can find those here.
And I think the Met now has a few more people loving it...