Steam Skins

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=178

There are many websites with custom Steam Skins available for download, please use your favorite web search tool and look for "Steam Skins".

If you are having problems with Steam running, you should always reset your Steam Skin back to the default green or grey skin until your problem gets resolved.