Very difficult to adjust the background color of ads with a website that pattern / spot. Is there a special trick to do that? Thank you for sharing
There is no special trick to do that. But what you can do is add your own border to ads. By putting a graphic larger than the ads below them (as a div background for instance) That will make the ad more integrated in your site design. They don't allow transparent background because they would have no way of knowing if webmaster don't try to hide parts of the ads, like url or description by setting a color similar to the page's background color.