I’ve seen those AdSense image tricks quite a lot over the internet: place images close to your AdSense Ads to draw more attention to your Ads or make your visitor believe the images are directly related to the displayed Ads. There even exists a WordPress plugin that does that trick.
A very questionable method to increase your click rate.
Google now clarifies the situation and clearly doesn’t allow such misleading image placements any longer. Since Google’s contextual Ad technology is quite smart, I bet they’ll find a method to discover such image placement automatically and block AdSense there.