I like the integration of adaptive icons for Android. I’m really keen on selecting a theme based on my current wallpaper and that color being used for all apps.

Not many apps are currently supporting it, even Facebook and other players you’d assume could do it in a seconds aren’t.

Implementing it looks fairly straight forward, you provide a transparent image of your logo and it adaptive naturally to suit your theme. I assume apps are intentionally being difficult because that visually changes their logo / branding.

It’s great when it works tho!