Oh, another negative about black faceplates that really got to me was the constant specks of dust that were visible on the system. Even though I'm fully aware the same amount of dust must be on my silver modules, I can relax much better in front of my synthesizer without having to constantly brush some specks off when I'm sitting in front of a full silver system.
Luckily there's still manufacturers who are doing silver plates so I don't have to bother with some custom designs (I really wouldn't).
I think modules like MI Clouds really showcase how much can be done with multicolored LEDs on an aluminium panel, the Blend interface is nothing short of genius. IMO FR4 panels feel cheap and lazy on devices that cost as much as Natural Gate or the Nautilus. Underneath the panel it's just multicolored LEDs, and the panel just diffuses the light.