Google loves advertising itself especially when it comes to it's own products. So it's no surprise that new Google Adsense ads were spotted with the Google Logo either in the right hand side or in the left hand side. These were found at SE Journal:
Why IS This So Important?
This is important because this could becomes the new Google Adsense Ads. And if so may mess up any blending you may have done with your ads. So it's important to watch out for these new variations in case something does get changed.
Thank You