We have seen attempts at Windows Phone skins on the iPhone before, but they tended to be pale imitations.
Metroon, a Dreamboard theme for jailbroken iOS devices is however coming pretty close, certainly preserving the smoothness of Windows Phone, though not exactly sticking very faithfully to the formula.
The skin is more a hybrid if Windows 8 and Windows Phone, and would of course be even better if it did not occasionally dump you into the garish iPhone launcher.
The app costs $1.50 at the Cydia store, but we suggest for the full Windows Phone experience a Lumia 900 can be picked up for free at Amazon pretty easily.
Via The Verge.com
Thanks Alex for the tip.