Google’s AdSense product has offered a number of ways to design and customize ad units and styles over the years. Starting with strict HTML embeds of the colors and formats, then moving to a Google-hosted ad unit — allowing you to manage an unit on google.com/adsense.
Google is stepping up the game and allowing publishers to more effectively create ad units that will hopefully convert better — for both publishers and Google.

The ad unit customizer allows you to choose a contrast type, and then customize the colors based on the contrast.

WebdesignLedger.com has some further reading on The Principle of Contrast in Web Design.
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