Of course I'm not trying to impose my personal choice. I stated black because it's the default setting (25, 25, 25) already present.
Above all I like this sort of thing kept *simple*. I would like something in the general preference menu as an option giving to user this control : "Whatever how your solids were made, all E+V will be displayed with this color (insert a choosing box)." And thus spread it to all objects which are solids in essence (extrusion, revolution, etc; and clone, polar/rectangular net, mirror, boolean, etc: made with.)