1. http://www.powerpointart.com/pages/free-1.html

2. http://www.clipart.com

3. http://school.discovery.com/clipart/

4. http://www.webplaces.com/html/sound.htm

5. http://www.absolutely-free-clipart.com/ffindex.html

6. http://www.top20free.com

7. http://theteacherspot.com/school_clipart.html