data-icon="✪"

Added a couple colours and a disabled state. Aaaand icons. You can either use Unicode symbols or the freshly released Pictos-Font icons. But the real beauty is in its markup that allows super fast color/icon/text changes without touching the CSS:

(a href="#" class="button orange" data-icon="✪" )Label(/a)

* ( ) = <> Dribbble doesn't like strange attributes. ;-)