That "common side" design looks interesting, and so do the four "national sides" that you designed. (As for the globe, well, the "Khaleeji" or "Gulfo" or whatever is currently a project of those four only, so maybe the "map" should focus on that geographic area ...) Cannot tell whether the designs are OK from the point of view of somebody who lives there, but I like them.
Whether that common currency ever comes, who knows. If people perceive it as a "Greater Saudi Arabia" project, it may not be welcome. At the GCC summit in Kuwait, about two weeks ago, this monetary union was discussed too - seems that the four will set up a monetary council (early 2010) which will later become a central bank which will later issue a Gulf currency. So forget about the "2010" date on your designs.

Christian