Due to the forthcoming new versions of Windows Live Messenger and Messenger Plus! Live it is extremely unlikely that a request will be fulfilled.
As an alternative you can use
Your Skin Control script to select images of the iPhone to create a skin.
With WLM 2011 coming soon, there are very few new skins for WLM 2009 being developed, so that script is your best bet, or just finding an existing skin from the
Skins Database that you like the look of