Round icons for third party apps?

[mattalter]

This article talks about icon masking for third party apps,
galaxy-s7-icons-round-masking @ droid-life

Had some time with an S7 at att and BB, but could not see a way to apply these icons to third party apps. Any one know how this is done using the stock launcher?

 

[Thegreatone3]

Settings - Display - Icon Backgrounds

 

[mattalter]

txs