I have posted a thread, something about this topic 'but not quite' in the Civil Aviation forum. The thread can be found here Airline Tail Livery - What Is That Thing? (by 9MMAR Aug 10 2006 in Civil Aviation)
So, for those who have yet to make up their mind on their favourite tail livery, the thread can give you a further understanding of many airlines' tail livery.
As for me, my favourite is the flying 'Wau Kucing' kite of Malaysia Airlines.
Just in case you didn't quite see it, turn the Wau Kucing 90 degrees to the left, stylised it and there it is, MH
's tail livery.