I just realized that this emoticon is of someone raising their arms into the air in triumph, and not someone squishing their face with their hands so that their mouth makes an O.

Check out https://github.com/Crazepony. From a brief look, you'd need to write C to change the firmware, but you can write a client in any language and connect via bluetooth (https://github.com/Crazepony/crazepony-android-client-none/b...).