Sorry, I should have clarified. The samples are just little rectangular pieces showing four different thicknesses of the material and showing how they look both textured and untextured. There are no knobs on the red, blue, smoke, and clear (bottom) photos while the green and amber have knobs explained in the "Notes:" section at the bottom. (i just got finished writing an RFC as homework for a class, so i'm in this overly formal mode).

The pictures show the button LEDs hitting straight against the textured plastic, so the diffusion looks decent. But when the LEDs are filling the hollow buttons (and hopefully filling the sidewalls), the light will look even bigger and more defined (I hope). And if not, then blast, maybe I should have used the milky polyethelyne instead...