That’s clever!!! 
Jcome, all those icons are awesome!!!
Please ask for a patch if you haven’t done yet!!!
I have a little idea for the Child Panel icon.
What about to mix the Canvas Icon and the current Child icon?
Say it could be a smaller green sphere with some children attached to it. What do you think?
Children are children of a canvas, so they should hang from it 
-G
Genete, thanks.
patch and sif files (including the new children icon using your nice idea:)) for panels are committed into tracker just a few minutes ago.
it is a good idea, see the result as attached.
next, I will cleanup and submit the rest icons your mentioned in this thread, and after that will take up layer icons …
Exactly! maybe a bluish child instead of a greenish one?
-G
the choice green is because in the children panel, we have always two items, the first is Canvases, it should be in green, the canvas color 
isn’t it?