Clock Message Board
I have built an internet-connected clock to display the always-accurate time, as well as to scroll text messages to display information. It includes a temperature and humidity sensor, so it can report the conditions back to Home Assistant.
You can view the project on GitHub pages if you're interested in building it for yourself. A full description as well as configuration and usage guide are published in the git repository, and the 3D printed case is available on TinkerCad.