Installing new XWiki skins

Francois Constant posted some nice-looking skins on this page: http://www.xwiki.org/xwiki/bin/view/Dev/Skins However, I wasn't able to figure out how to install them. There is a link to a topic on HowToCreateASkin, but it isn't clear to me how to apply the information on that page to install a pre-packaged skin. If someone could provide some pointers, I would be glad to edit the page and add the necessary info. Regards, Stephen