I am aware of the question Drawing over the desktop and I don't think this question is a duplicate.
I need a simple way to draw stuff above my Gnome Shell desktop with some scripting language. The preferred solution would be one which doesn't depend on installing a composite manager or making a transparent window.
It seems that Clutter can deal with multiple z levels, and extensions such as WindowOverlay Icons make me believe it IS possible to do draw above the Desktop.
Now, I've just installed libclutter-1.0-doc but I can't find good examples on how to do it. Besides trying to understand WindowOverlay Icons source code, is there any snippet or tutorial showing this specifit use of Clutter?
Thanks in advance.