Designed and printed a base for glass blocks. It has a circuit board that I designed and software written by me. It is controllable via MQTT and I have it integrated with HomeKit via Home Bridge.
Writeup on project and design files - https://www.ghost7.com/glass-brick-light-with-smart-control/
It is purely decorative, it could be used to indicate air quality with different colours or alert to events, it is controllable via MQTT and I have it tied into my HomeKit setup. It is just a filter, I needed to break up the individual pictures, I have not used a non digital camera in quite some time.
(Also god damn Lemmy is broken right now, been trying to post this comment on and off for hours now).