Now Adsense palettes in your Adsense Setup page will be lot shorter. Now there will be only six predesigned palettes. Out of Six three palletes have been remaned to Seaside, Shadow and Blue Mix; And three new palletes called Open Air, Graphit and Ink have been introduced.
Inside Adsense blog says:
“We made this change to streamline the choices, getting rid of a number of palettes that don’t typically perform well while also encouraging you to create your own custom palettes that fit better with the unique look and feel of your site (blended ads, anyone?).”
But Older palletes will still show up in Custom Palettes section 
Inside Adsense >> Cleansing our palettes
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