You have the pictures that you want to use for new icons saved on your device.
Once you're ready:
Create a new shortcut.
William Antonelli/Insider
2. Tap "Add Action."
3. In the menu that opens, search for "Open app" and select it when it appears under "Actions."
You'll be making a shortcut that opens an app.
William Antonelli/Insider
4. Tap the "Choose" placeholder and select the app you want to make a new icon for.
You'll want to select the app whose icon you want to change.
William Antonelli/Insider
5. Tap the three dots in the top-right corner to open an options menu.