Imagine a Pixelblaze with:
- a narrow profile (like the Pico) so it can be pretty much sticked to or in the same axis of a lipo battery
- a microphone, light detector and gyroscope (better than a simple movement sensor).
- works straight on a lipo/li-ion battery and handles charge of this battery without a 5V step-up board
- a ON/OFF button to turn it on and off
- a couple buttons that can be re-purposed in-pattern
- a bluetooth app to control it (i lose internet every time my phone has to connect to it in Wifi)
The absolute wearable killer. Nobody does this on the market. You’d sell tons of it (or at least quite a bunch to me 
)
Love.
Note: the current one is already great 