If (part of) the content of a blog is published in RSS format, then it is likely that the de facto standard icon is used to advertise the feed.

Today, I launched my site Howtodude.MOBI. It is the mobile edition of Howtodude.NET. I was looking for an icon to advertise Howtodude.MOBI on Howtodude.NET. Unfortunately, I had to make one as I could not find one (upper right corner of Howtodude.NET). That means that users may not recognize the icon at first sight.

The quality of my icon is not great as I'm not a designer. It would be great if somebody could release a professionally designed icon under the GNU licence, so that the icon can be used across sites (like the RSS icon).