(Quoted from :http://fluxspace.sourceforge.net):
Fluxspace blends Fluxbox's window management with new desktop management capabilities. It leverages existing components and the power of Python to help build a flexible desktop environment around Fluxbox and other lightweight window managers.
Add per-workspace desktop icons and panels to Fluxbox by integrating tools like Rox Filer and Idesk.
Decorate each workspace with different wallpaper.
Manage your startup applications.
Automatically start and stop applets as you enter and leave workspaces, allowing each workspace to have its own unique tools and dockapps.