Cameo is a neat BlackBox for Window or (Windows Shell). Basically, it is an open source portable desktop environment that can be used in place of Windows Explorer. But it's more than just that. The full version includes many Open Source Portable Applications that can be run from within. It is based on a modified bbLean shell, offering a more Linux like style, look and feel.
Cameo Windows Shell Blackbox for Windows
Extracted Size: Size varies depending on plugins used
Authors Website: Project Page
License: Open Source
Download: download this Blackbox Shell for Windows