You MAY USE that flag.
IT IS *JUST* a DRAFT. It is NOT the "official" one yet, nor is it the final version. It needs to be cleaned up. (As soon as I can get Photoshop, I'll make the final version.)
You MUST give attribution (to me) AND copy the Creative Commons license (the Attribution-ShareAlike 3.0 Unported version) ANYTIME you use it OR any derivatives you create on it (icons, buttons, whatever).