클립아트 다운로드
1. http://openclipart.org/
2. http://www.wpclipart.com/
3. http://www.clker.com/
4. http://www.clipartheaven.com/
5. http://www.artvex.com/
6. http://etc.usf.edu/clipart/
http://www.dreamstime.com/free-photos