I'm most using the Stream Deck for retro gaming, and in particular, flight sims that have lots of keyboard commands.
In addition to simply mapping hotkey, I discovered that you can dynamically animate the pictures on each key by sending a sequence of MIDI values from something like ControllerMate, which is then received by KM and displays the corresponding frame of animation on the Stream Deck keys.
This shows some of the things that you can do. The numbers on this display all dynamically change, as well as the pictures changing, depending on the stores values.
Way off topic here, but since you asked.