I’ve seen pretty amazing laser etched plexies on some sticks, but never have I seen anyone do anything with it. When I say do anything I mean illuminate it. Here’s an example:
Just etched plexiglass w/ an illumination bar up top.
Now look at what happens when you shine light down the edge:
It would take a bit of case design tweaking, but with all the custom builders out there, folks should be getting more out of their laser etched plexies. Here’s an instructables article which covers building a multi-color name sign:
The micro controller circuitry is not necessary, just look at the box design and basic LED setup.