The best thing about the RSS icon is that it doesn’t have to look like one. You can morph it, change it’s color, alter it’s shape and still make it distinctly identifiable by just adding a dash of orange or the radio beacon. Take a look at these clever designs. Use them on your website or draw inspiration from them to create your own.
Design freak has an amazing stock of RSS icons. The following set comes from them.
Some more from Design freak
A set of 15 RSS icons from 0at.org
From Smashing Magazine
Miscellaneous RSS icons