Customize notification tray

Is there any way to customize the UI of the notification tray (may have wrong name for it but the place where you read notifications after swiping down once from top of the screen). For reference I have been looking into an upgrade from my Samsung galaxy s5 to an s7 edge or s8 edge but want to pixelify my phone as much as possible without installing a custom ROM. Google launcher only changes the UI so much. I would be fine buying a non Google phone if I can customize the notification UI as well.

Thanks in advance for the help!

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