For the past month I've been working on a Live USB stick/DVD version of the operating system for the One Laptop Per Child project, "Sugar", based on the work of Jean Piaget and Seymour Papert on the "constructivist" model, in which you learn not by remembering stuff but by doing and by building things.
As a "desktop", it's twenty years ahead of the ubiquitous 1970's Xerox PARC Windows-Icons-Menus-Pointer systems that we are all still using, and an outstanding example of "less is more". I'm using it as my main desktop (on and off) and despite its spartan simplicity I find I can do everything that I used to in the old, hairy interfaces.
My work was outpaced by some people who were already working on something similar Trisquel_On_A_Sugar_Toast and I'm flattered that their "release announcement" for it is just a link to my post in the Sugar developers' mailing list in which I evaluate it. Well worth trying out.
Update 2021-02: I've quit sugarlabs because it's corrupt. They have no public acounts, most of the money is attributed to "legal" without receipts, and the thrusting developer, James Cameron, weans people in, to increase the "developer" count, then blocks their work in every way he can to retain his illusion of supremacy.
Take a copy and do what you wish. Don't bother with the org.