Lucidity is a simple free desktop enhancement tool which will set a custom image as your desktop background and then allow you to change the transparency of the windows on top, creating a very nice effect reminiscent of the Gnome desktop in Linux. It is a freeware desktop customizing application that's easy-to-use.
Here are some screenshots to illustrate the features and user interface of this application:
7+ Taskbar Tweaker
Easy Dark Mode
Open Shell
DesktopOK
Earthview