We've activated a feature in the forum that allows you to create your own Avatar by linking to a URL. I'm glad you're enjoying them; the dancing chicken is very cool!
Be as creative as you like, but please keep in mind that the Avatars are bound by the same rules as the forum in general.
You can link to your own custom Avatar by going to "my profile" and clicking on <>. Go to "Avatar Image" and click on "Select a different Avatar Image." You will find a new option at the bottom of the dialog box: "Use Custom URL"