creating sharepoint themes

Create a custom site theme and make it available to others

http://sharepoint.microsoft.com/blogs/GetThePoint/Lists/Posts/Post.aspx?ID=122

Customizing SharePoint Themes with SharePoint Designer 2007 and IE8

http://blogs.msdn.com/b/kaevans/archive/2009/03/08/customizing-sharepoint-themes-with-sharepoint-designer-2007-and-ie8.aspx