With the Multicolr Search Lab, youcanbrowse through 10 million of Flickr’s most ‘interesting’ CreativeCommonsimages, andfind ones that share the samecolours.
But even when I used Haiku Deck to make a deck of my trip to Charlottesville, the app's smart suggestions of photos that might go with keywords in my slides were entertaining to look at and I used several photos from CreativeCommons to supplement images I didn't have.