Hi,
maybe I'm not the only one who missed cliparts with the usual FOSS
suspects. By chance (ok, so I found it via an article on Pro-Linux.de),
I stumbled upon:
http://www.openclipart.org/ who have public domain
cliparts. Even better (for Debian users anyway), it's available as a
package for Debian (in testing anyway), possibly also for others.
The original format for these cliparts is SVG, they can be used at
least with inkscape, sodipodi,
OpenOffice.org and AbiWord.
Have fun,
Eric