=== Searching for Multimedia ===
When searching for unrestricted graphics content, it is hard to beat the huge commons of Wiki commons. Use the search engine on toolserver.org to find the images or other media you're looking for. http://toolserver.org/~tangotango/mayflower/ Any image found there can be used under the terms of the (creative commons) license listed -- meaning it can be used here or on your website.
Flickr also has millions of images licensed under creative commons licenses: https://www.flickr.com/creativecommons/
=== Native (Application) Search ===