Enlightenment 17 is a nice and smart window manager. E17 helps the user create an UI customization with less work than doing it the old fashioned way.
To install it, all you have to do is follow these steps:
1. Add the enlightment PPA:
$ sudo apt-add-repository ppa:efl/trunk
2. Update the system:
$ sudo apt-get update
3. Install the Enlightenment 17 window manager and the needed libraries:
$ sudo apt-get install e17 libedje-bin libqedje0a libqzion0a
Now, all you have to do is logout and select E17 in the login menu.