It is not a free ball. It is fireworks ball effects. They haven’t actually given a free holiday ball in a year or so. It has been ball effects. These are used with any ball you have.
On the web version they can be accessed by clicking on the wand on the left side of the screen. On the IOS mobile version it is slightly to the left of where you set your spin. Not sure if they changed it on Android with the new look after the last 2 updates.
And what free ball Icon? There was a free St. Andrews ball for entering the July virtual tour tournament @ St. Andrews