What is a good site to use for art?

Rijksmuseum database(!) http://www.rkd.nl/ Metropolitan Museum http://www.metmuseum.org/toah/splash.htm Insight http://www.davidrumsey.com/collections/ There are also online collections of 'clip art', just do a web search, and stock Photography collections like Digital Stock. You can browse images, download low res 'comp' images and purchase high quality digital files.