Difficulty: Moderately Easy
Instructions
1)Log in to your Google AdSense account with your user name and password.
2)Click the "AdSense Setup" tab. Select "Manage Ads."
3)Select the AdSense ad you wish to modify by clicking "Edit Ad Settings" to the right of the ad name.
4)Find the "Colors" section and click the color box to the right of the ad items to change the color of each item. Click the color of your choice to select it. Set the colors of the "Border," "Title," "Background," "Text" and "URL" in the same manner. Alternatively, click the arrow to view the drop-down list of different palettes from which you can choose. Click any palette to select it. By selecting a pre-designed palette, each of the separate ad items will have a preset color within the palette.
5)Preview the ad by clicking "Preview this AdSense unit." If you like the colors, click "Save Settings." If you do not like the colors, adjust them and then save your changes.
6)Repeat the same process to change the colors of each ad within your account.
Tips & Warnings
Google suggests several approaches for setting AdSense colors. Some readers may be more likely to click ads that blend in with the colors of your website. Other readers may be more likely to click ads that contrast and stand out from your website. By changing the ad colors and monitoring your clicks, you can determine what colors work most effectively for your website.
http://www.ehow.com/how_8341808_change-adsense-colors.html