Write your own CSS to get the appearence you desire. Practice FIRST with your
PC and a mock up of your data & CSS in a txt file. Then save as html file and
open with your browser. After you are satisfied, switch to SharePoint. You
will find lots of CSS quirks that behave differently. Sorry, but keep
experimenting til you get it. Then, store your CSS file in the Style Library
of your root site. Make a new folder for it. Then link to it in the aspx page
displaying your RSS feed. We do this on a MOSS site.