Clip Art Sources

American Booksellers Foundation for Free Expression.  Although there is a small cost for these posters, they are very good for use during Banned Book Week.  

Again, though not free, the photos and/or subscription to IStockPhoto is reasonable with thousands of photos.

TheFreeSite - Free clip art resources

Thousands of free photos and images on Microsoft Word

Census Bureau's Broadcast and Photo Services  ( Libraries may use these photos, but must credit the photographer.  Click on Photo Services.)

everystockphoto.com (A source for free photos.  Note:  After you sign in, it appears the "sign in" form keeps popping up.  However, if you go ahead and enter a subject for the photo you're looking for (e.g., library), it sends you on your way.)

Marketing Treasures and Library Clip Art (Chris Olson & Associates)

Library Media and PR  (Click on Tool Box on the left.)

Discoveryschool.com (A good clip art resource. Go under "Teachers." Look for "Clip Art" in the left sidebar.)

stock.xchng (One of the largest repositories of free stock photos.  But, some are for sale.  You can tell by hovering over the photos.  You must pay if you see "stock photo" when you hover over the picture.)

Stock Vault (high quality photos)

Dreamstime (link to free photos)