Admin Forum:Customizing

Ok, I was looking at some wikis and they have their header and stuff customized relly cool. As far as I know, I am not able to do it in the them designer. Can someone help me? May StarClan light your path, 22:40, August 3, 2012 (UTC)
 * Help:Forums. I hope this helps. -- http://i151.photobucket.com/albums/s145/urbancowgurl777/UltimateSupreme2212-3.png  (Talk to me) 04:52, August 4, 2012 (UTC)