From their web site...
Drawing Together: This project aims to create an archive of user contributed clip art that can be freely used. All graphics submitted to the project should be placed into the Public Domain according to the statement by the Creative Commons. If you'd like to help out, please join the mailing list, and review the archives.
So head on over, sign up, see what's available and maybe even share some of your own work.
Link: Open Clip Art Library
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