Yellow Background Trial for Top Ads
The Adwords ads that appear at the top of the page - usually 2, sometimes 3, have occasionally been appearing with a yellow background, rather than the standard blue. Pic here.
Google seem to be overly cautious with their testing, and few trials ever become reality, while many stay on trial forever. I can't see why you need 500 billion test searches instead of 10 billion.
To me the answer is obvious - have 5 other colors, and for every 5th search replace the blue with one of them. It will reignite the ads for those who are blinded to them due to seeing them too much.


