Android Central on MSN

Here's how you can force your app icons to match on a Google Pixel

Google Pixel phones support app icon theming in beta, and it can give your Android lock screen a consistent look. Here's how ...
The Droid Guy

How To Set Custom Icons For Your Android Apps Tutorial

Use a Square Image with a Transparent Background: For optimal results, use a square image with a transparent background. You can find such images online or create them using photo editing tools.