One of the new features for the Xbox 360 is the ability to give your avatar a prop. Microsoft has a free Windows Phone 7 prop for your Xbox avatar that shows up with your Xbox avatar on your Windows Phone smartphone too.
Head over to “My Xbox Spotlight” on your Xbox 360 and select the free offer there. A quick series of actions adds the Windows Phone prop to your avatar. The prop shows up with your avatar on your Windows Phone smartphone itself shortly afterwards. There appears to be a bit of relatively slow over-the-air server updates to your phone at each subsequent visit. Let’s hope Microsoft can speed up this interaction in the near future.
You can see the sequence of events in the screen photos below that led to my Windows Phone avatar gain its Windows Phone prop.