Over the last three months, I did a detailed experiment involving about 190,000+ visitors and 3 websites to find the best performing color schemes for a website and the adsense ads. The results were 1. Shades of blue, Shade of light lime green are favorite colors of most American males. 2. Shades of pink are favorite of most American females. 3. Orange shades does not fly much with American males. 4. Shades of blue are not popular with American females. 5. Indians are ok with the shades of Orange and blue color. You can see the full experiment here http://arpandeb.com/10/2011/piece-of-mind/the-best-color-for-adsense-ads-increase-your-ctr-now.html
Wow, I never thought colors would make such a difference. Is there a way to configure ad colors for certain countries?
Yes, you can configure the colors and themes based on location. I guess you have to write a script to do that.