Been working on a LED display idea, the goal is to show the dimming level. I'm using white perspex, with 3mm diameter holes (not all the way through), and 3mm blue LEDs inserted into the holes. The LEDs are driven from a TLC5940. As the LEDs are really bright, I'm able to run them at ~1mA each with great results.

To give you an idea of what I'm hoping to achieve, here is the blank switch with paper in front of the LEDs. The images don't really do them justice. Looks really good in person. Also note that ambient light is shining both sides of the perspex. When the perspex is inside the switch and not being backlit, it looks even nicer.