In the past few months, we have covered plenty of devices that can notify you when you have a new message using lights, vibration, or sound. Need something different? You may want to build your own bubble notifier. Blup is a smart notifier that uses a bubble in a container of liquid to notify you of any event of your choosing.
The developer used a nano air S1 pump, Adafruit Huzzah ESP8266, 8 feet air line tubing, and a few other parts to complete the project. More information is available on Instructables.