I liked the underlight test, made some changes, and mounted it on the machine. This is an Arduino, some WS2812 Individually addressable LEDs (waterproofed, because I like the glue covering a lot. )
I like the slow color changing. I had some that were a lot more extreme light shows, but they were a bit too distracting.
This show fades from green to orange with some purple and white in the middle. I used a lot of clips to make it cleaner to mount. So, it's adhesive-backed LED strips, an Adruino, and a power supply.