According to this thread on the Pakistani aviation website, PIA will be introducing a new livery soon; the new fleet will first be introduced on a 743, now in for maintenance at KHI. The new livery can be seen on this thread:
History of PIA - Forum :: View topic - AP-BFW With New Tail Livery ?
The green and gold stripe should look quite good.
Sadly, this means the end of the regional tail colour schemes, but at least it'll be an improvement on the rather cheap illustration of the flag on the tail of some of the current 777 fleet. It's a pity that we'll miss the sight of those wonderful colourful regional tails, though:
JetPhotos.Net Photo » AP-BHV (CN: 33778) Pakistan International Airlines (PIA) Boeing 777-340ER by John Fitzpatrick