flickrCC
Search for Creative Commons images on Flickr and edit in Picnik right from the search
Flickr: The Commons
Collaborative project between Flickr and the Library of Congress (and hopefully other institutions in the future) to share and tag public domain images. Currently 3000 images from the Library of Congress collection are available.
MOO.com | We love to print
Upload your own pictures from Flickr or use the designer options provided to print mini-business cards, stickers, postcards, etc. I think this would be very cool to have some cards the next time I go to a conference.
Blank Cell Images - an album on Flickr
Cute idea for comics or scenarios--create scenes with lego people or other toys. These images are licensed CC-By-NC-SA. This photographer also has an album with some of the same images and talk boxes already added.