The GravatarImageSource is meant to be an easy to use ImageSource that you can use to easily get the Gravatar Image for any email address.

      <ap:GravatarImageSource Email="{Binding Email}"
                              Default="Retro" />


The GravatarImageSource defaults to a default size of 20 and default gravatar of a MysteryPerson.

There is additionally a XAML extension to make it's use even easier

  <Image Source="{ap:GravatarImageSource Email={Binding Email}}" />