This is what the ad said:

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For $19.95 you get a 2 year premium membership to WinCustomize.com which comes with these benefits:

Full library integration into Stardock Central

Unlimited Bandwidth Usage

Two free premium Theme Suites

System Tray skin browser for keeping up with the latest skins, themes, icons, and more! The WinCustomize Tray sits in your system tray and keeps you informed of new skins and themes as they are released. Then, you can instantly grab them and apply them. It's convenient and easy to use.
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How do I get the free premium themes?