The naysayers about the 'valve-stem lights' were wrong: they are still working!
But, time goes on, and, well, nobody can really tell what those things say and there's no obvious way to update the firmware. (Yes, bike valve-stem firmware, its a thing, get over it).
So enter this. Its *much* brighter (driven by an 18650 battery), bigger, and, they say, can do real images and animations. So sayeth the video.
But even better, the device has open source firmware on github. Its some sort of 8251-derivative processor, so its not exactly a super-computer, but it seems to be able to do some decent effects. Here it is installed on my tire, and below the promo video showing it in its glorious rubik's cube action.