The iPhone graphic is swiped from a Kotaku article about iPhone motion controls, and the arrows are kind of terrible, but this is the basic idea. Frankly, the "Gryroscope Controls" is probably too techy for a screenshot ad like this, the text "Motion Controls" would probably sell better with mention of the gyroscope in the app description for those who realize what that is and why it's better than what was available pre-gyroscope:
EDIT: Here's the PSD file if you want to copy the styles or anything: http://dl.dropbox.com/u/6692701/gyroscope.psd