To blend or contrast that is the question!! Based on what I have read from a few blogs, there are mixed recommendations on whether to blend your ads with the content on your site or to contrast it. By blending, you make your ads seem like they are part of the content while contrasting makes them stand out. Its hard to say which method works and probably depends a lot on how your content is structured.
Dinesh.com is primarily a blog and information site and most of my users spend time reading something and I have found that the blending method works best over the contrast method. This is probably because when someone is reading something they typically do not want to get distracted from what they are reading. I have managed to use the blend technique in the following way.
Blending ads with your content is not against the policies of Google Adsense, unless you do something that Google prohibits. As usual, I recommend making the change and seeing the results 1-week before and after the change to determine the impact.