We’ve recently received a number of emails from publishers asking how we feel about the placement 
of images near Google ad units. There’s been some confusion on this issue, and so we turned to our policy team to set the record straight.
Can I place small images next to my Google ads?
We ask that publishers not line up images and ads in a way that suggests a relationship between the images and the ads. If your visitors believe that the images and the ads are directly associated, or that the advertiser is offering the exact item found in the neighboring image, they may click the ad expecting to find something that isn’t actually being offered. That’s not a good experience for users or advertisers.
Publishers should also be careful to avoid similar implementations that people could find misleading. For instance, if your site contains a directory of Flash games, you should not format the ads to mimic the game descriptions. Inside AdSense: Ad and image placement: a policy clarification