Creating a Custom Formatter to replace a Link with an Icon / Image

I would like to replace links in a view I have created with icons. The links are dynamic(varying URLS) but will be be within 5 domains, eg:
www.example.com/page7
www.example.com/page2
www.example2.com/page9
www.example3.com/page77

I would like to provide an Icon for each of the Domains which is applied to the link, so that clicking on the link takes the user to the URL(in a new window) and the text is hidden.
I am aware of CSS image replacement technique but would like to use https://drupal.org/project/custom_formatters to do this. I am also aware of https://drupal.org/project/image_link_formatter .

Using the Custom Links Formatter module would allow me to import/export, save, reuse and share this function.