Change the colors of your AdSense ads to match closely your website, so if your website colors are white and red, you should edit your AdSense ads to have a white background and red title. The key is to do A/B Testing and see which colors are performing better, some people myself included have better CTR by just using the default AdSense white and blue colors with just the font style changed.
Contributor: Stephen Montagne from nethustler.com