As spotted by Jensense, Google have been testing yellow backgrounds against the top central PPC listings instead of the usual blue. Why the tests? Well, Google are known for their continuous testing and experimenting with different ad styles and formats.

So why the different colours?

Are Google trying to increase the importance of being in the very top paid results by drawing greater focus to these listings?  Are Google just testing to see if ‘banner blindness’ has begun to take place with the older blue colour as Jen suggests?

Sure the yellow may draw more eyeballs, but they also look very out of ‘theme’ to the rest of the blue in Google SERPS and may make it more obvious that these are paid results to the average internet user.

Check out the screen shots below.

Yellow PPC adverts