Add some WS281x type RGB LEDs to your printer for a quick status update
Supporting effects for various printing states as well as print and heating progress, you will always know what your printer is doing without needing to look at the web interface all the time.
Configurable options include turning on and off each event, customising the effect and colours, tracking print and heatup progress, enable a timer so you can have the LEDs on at certain times and a button in the navbar to turn them on and off
See here for details of the various configuration options available for the plugin, and have a look at the screenshots below
Setting up SPI
See here for details of how to setup SPI so you can use your LEDs. There is also a configuration wizard that will do this for you on the first install, if you ask it nicely.
Wiring your LEDs
See here for details of how to wire your LED strips to a Raspberry Pi.