1. Log in to your Google Adsense account.
2. Click 'My Ads'.
3. Click on an existing ad and click 'Edit Style'.
4. Use color hex codes or select a color by clicking the color box for the different Adsense elements that you wish to change. You can adjust the fonts, border, background and link colors.
5. Click 'Save' when you are done making changes. The changes take a few minutes to reflect on your website.