Add a drop shadow to the taskbar with using this tool, No installation needed.
It works on Windows Vista, Windows 7, Windows 8, Windows 8.1, support both top and bottom taskbar.
Other than the ability to right click the shadow, it is non intrusive and doesn’t show anything in the system tray.
Right click the shadow to choose preferences or to close it.
-Adjustable opacity (darkness)
-Option to run at startup