The lights can be useful in many ways. I could see them being useful in the arts classes a lot for more 3 dimensional projects. They could also be used by classes or clubs that host events as a way to do some small amounts of lighting.
I don’t have any pictures of the code I did but it was fairly simple and just used the pins with variables to set it to an on/off switch using the buttons.
I think that realistically MicroBits best use is in IT classes as a way to introduce coding as a change to using Scratch.