If you look at my video above, you would hardly recognize OAP as the overlay. That's because I made a very simple change in the wallpaper. The background now has custom colored squares visible by making the OAP icon background 100% opaque. One of the reasons I wasn't immediately taken in by OAP was the lack of button customization.
So here's my wish for the next iteration of OAP - give us the option of custom wallpaper for every screen of OAP. One for the main screen, one for each dashboard screen, one for music, etc. That way, we can really make OAP more visually appealing and customize it for our cars.
Edit: In the video, toward the end, I said it would be nice to have a different wallpaper for every button - I meant for every screen of OAP.