The website below has many examples of book trailers:

www.digitalbooktalk.com

The websites listed below can be used to look for images and graphics for your books trailers:

http://www.flickr.com/

 http://www.pdclipart.org/

http://www.wisegorilla.com/clipart.html

http://memory.loc.gov/ammem/index.html

http://www.loc.gov/rr/print/list/listguid.html

http://images.google.com/

It is important that remember to give credit to the sources of you images at the end of your project. 

Use the bibliography sheet linked below to create a source list (click on the notebook).