I have a transparent project box encasing my breadboard with an LED on it. I want to use this LED to make the whole top of the box glow uniformly. Does anyone have any ideas? I tried using soft plastic, about 4 mm thick and drilled a whole halfway through it for the LED. Even after using sandpaper, you can still clearly see where the LED is, and the illumination is a quarter of the box, at most. The box is about 5×7 cm.