That wasn’t the main point of the video, but there’s potential there. When WP8.1 gave us the transparency tiles with parallax type wallpaper, some used blank coloured backgrounds to show simply the icons.
In a similar light, these icons have been modified to appear as circles. It looks more like the generic smartphone homescreen.
If all it took was to select circles then I guess if you know how, you can change them to the Nokia squircles popularised by N9 or perhaps even Symbian.
An easy way perhaps to get this was if someone packaged it into an app (there are quite a few tile design apps out there)