Google AdSense: Understanding Alternate Ads and PSAs
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We all know that Google AdSense works by serving targeted Ads to
the websites that are enrolled with the Google AdSense program.
However, there are instances when no targeted Ads are available for
a website e.g. the website might be catering to such a topic or
subject for which no relevant Ads/advertisers are available. In
such a case, Google serves alternate Ads i.e. content of your
choice. If you have not specified any content as Alternate Ads,
Google AdSense program treats PSAs i.e. public service Ads as
alternate Ads and serves them on your website. These PSAs are
charitable Ads that don’t contribute to your revenue. So, unless
you are looking to do charity (which could mean lessening of
revenue for you), you must specify Alternate Ads upfront.
Here are the options that you have for alternate Ads (your choice
of content):

Color: A number of people use color for alternate Ads. This
involves specifying a valid hexadecimal color code (or you can
choose from the color palette provided by Google) for the alternate
ad. The choice of color would be such that the ad becomes
invisible. This is easily achieved by setting the color of the ad
same as the background color of the page.

Image: An image can also be used as an alternate ad. You can either
have this image link to some other web page (in such a case you
will need to specify an html as alternate ad) or you may just use
it as such (for, maybe, enhancing the beauty of your web page).
Another good option is to use ‘Collapsing ad units’. ‘Collapsing ad
units’ code will squeeze the ad units that are not utilized
(instead of showing the PSAs) on your website. This approach helps
in giving a cleaner look to the web page (since the blank areas or
non-ad-based images are done away with). It also helps in bringing
more emphasis to the AdSense Ads that are displayed on the website.

Have You ever wondered how people make money through the internet
by doing almost nothing?
http://great-money.net/adsense.html