Many of the organizations within the UN also have telling logos/flags as well as the days they choose to use as flagships (Earth Day for example.) The logo itself was designed by an ex-military architect. The leaves were lifted from designs of another architect that worked closely with this sort of stuff (Nuremburg, etc). Of course, this could be found likely with a google search.
I'm going to ask the girlfriend, an architect, if she has any source material on any of these designers or designs. Its unlikely as its not the sort of thing down her alley, but I'll post back if something interesting turns up.
As far as the popular flat earth maps that circulate, they are wildly inaccurate but serve an important purpose: helping visualize the basic historical theory around the flat earth.