Well, the only problem I see with using "Orange Empire" is, I think, because the only people who say "orange curtain" are the ones in LA. I don't think most people around the rest of the country would understand the term. Of course, I usually just tell people I'm from the LA area anyway. It's a lot easier to say that than to tell them Orange County and then try to explain where that is. I usually end up telling them it's south of LA anyway.