Thanks for trying Community Server Dynamic Theming.
This site is running a slightly modified version of Community Server 2007 which enables you to customize the theme for yourself.
Once you are logged in, simply click the
Customize link on the main navigation bar. From here, it should be very obvious what to do; just change some colors, add an image or two, pick a new layout, or even directly change the CSS.
You can also browse and download themes created by others in the
theme gallery.