Do you know about techniques that optimize the ads ? makes it blender better ?? Should the ad be in strong colors ??
"optimize" it with your site color, which mean follow the color of your website suitable to the frame also.
i've tried everything from perfect blending, to contrasting with bright colors - and everything in between. Every time, the blended-ads have performed best at my site. 728 leaderboards at the top of the page and large-squares just below the page title have always performed best. You'll need to test different things to find what works best for YOUR site..
quick 3 tips 1) dont spam your ads 2) blend in the background but keep the title nice and 3rd -> content matters