http://www.blazed-up.com/2007/04/improve-adsense-ctr2/ I'm sure some of you already have your own methods about blending in your ads and this is how I do it.
Blending your ads is not always a good thing to do. If you have a very good site with interesting stuff in it blending the ads(less interesting) is just making clicks go down. Not only that but google does not like this Ad hiding at all.
Not 100% original idea but thanks for the input anyway. I am sure it would serve it's purpose but there is what we call an adsense blind factor. It is when return visitors gets used to your ads that they no longer click it anymore.