Standard Feed Icon

While exploring other sites and blogs, you must have come across those orange coloured feed icons that give you an option to subscribe to that site's/blog's feed. Chances are that you are already publishing your own feed.

Here's a free resource that will give you more color options to choose from(for the feed icon), you can also download other file format of the icon to modify and customize for your blog/site.

http://www.feedicons.com