Flowers and Digital Arts by Michael Vicin <http://pixels.com/profiles/michael-vicin.html?tab=artworkgalleries&artworkgalleryid=526915&page=17>
MADID (Yale University Manuscripts & Archives Digital Images Database)
Bridgeman Art Library: art, culture & history images
Parker Library on the Web : Images of 6th-18th century manuscripts from Parker Library in Corpus Christi College, Camden.
National Galley of Art | NGA Images a repository of digital images of the collections of the National Gallery of Art