Google Checkout is testing some larger icons in Google Adwords listings to compare & contrast user click persuasion based upon icon size.
Google Operating System blog took these screen caps of the three styles of icons Google is now testing; the subtle cart, the defining brand, and the ‘in your face’ call to action button.
Hello,
I fell that there is no differece when google use the icon to attract the customers. And there is little chance to get the good results