Open ClipArt Library

OpenClipArtLibraryLogo_1

To quote from the homepage:

The Open Clip Art Library (OCAL) is the largest collaborative community that creates, shares and remixes clipart. All clipart is released to the public domain and may be used in any project for free with no restrictions.

 Open ClipArt Library

 The open clipart library is free to use and has a reasonable, though not enormous collection of images. Definitely worth a look but not as comprehensive as commercial offerings.