Antipixel | Buttons Redux: Tweakability - post/discussion on altering the look of the ubiquitous "xml.gif" button, prompted by his posting of a nice collection of custom button designs.

I've currently decided on using a text-only css-powered version, labelled 'RSS' instead of 'XML'. Recognisable enough, methinks. Scroll down to see it...

Update: here's the source code:
<a href="/rss.xml" style="background-color:#f60; border:2px outset #ffc8a4; color:white; text-decoration:none; font:bold 10px sans-serif; padding:0px 3px 0px 5px; letter-spacing:1;">RSS</a>