Did you know that you don't need to set up an ad serving system, such as Google Ad Manager to rotate between various AdSense color palettes? I'll be honest and admit, I did not know about this feature until I saw a WebmasterWorld thread where AdSenseAdvisor explained it could be done.
How do you do it? Go to Google AdSense, go through the set up of an ad unit and when you pick the color palette, you simple select the "use multiple palettes." Then you can pick up to four palettes for Google to rotate between. Not sure how I missed this feature, but here is a more visual walk through.
(1) Select "Use multiple palettes" from the drop down:
(2) Select the multiple (up to four) palette colors by pressing control or command and clicking on them:
(3) Google will then dynamically show those selections on the left side of that selection box:
Here are those ads in action:
For instructions on this from Google, read the Google help section.
Forum discussion at WebmasterWorld.