I have put together 4 tutorials to show how to create RSS feeds with the Gimp, these are the end results:

The tutorials can be found on my design and programming tutorial blog, Help Developer:

Tutorial 1: http://help-developer.com/index.php/2008/04/12/create-an-rss-feed-iconbutton/
Tutorial 2: http://help-developer.com/index.php/2008/04/12/create-an-rss-feed-iconbutton-part-2/

Tutorial 3: http://help-developer.com/index.php/2008/04/14/create-an-rss-feed-iconbutton-part-3/

Tutorial 4:  http://help-developer.com/index.php/2008/04/14/create-an-rss-feed-iconbutton-part-4/