They allow 3rd party skins and someone has already made a "happy" one: http://t-a-w.blogspot.com.au/2015/08/happy-factorio-mod-for-factorio-0124.html http://t-

They allow 3rd party skins and someone has already made a "happy" one: http://t-a-w.blogspot.com.au/2015/08/happy-factorio-mod-for-factorio-0124.html http://t-a-w.blogspot.com.au/2015/08/happy-factorio-mod-for-...