Placing random images next to AdSense ads

I've read several articles about placing small graphical icons or images next to your Google AdSense ads to increase the click-through rate (and income). The idea is that the visitor's eyes will be attracted to the image and then see the ad right next to it.

I experimented with this idea with my site, http://www.howthemarketworks.com/ , last year and it did actually increase my clicks by 10% or more!


The problem is that this can be against Google's policy, so you must be very careful how you implement it! They basically don't want the visitors to think the images are associated with the ads.