1. Meteor rain
Simple example using the following lib: https://github.com/ArminiusM/Neopixel which I have found on https://www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/
To install the library, you have to download the AGNeoPatterns folder from the repository above, put it into a zip-file and include this AGNeoPatterns.zip in the Arduino IDE as a library.
It allows me to define virtual strip segments in a long LED strip, so I can control the 6 strips separately even if they are connected to a single pin of the controller.
2. Bouncing Ball
added to my Github: https://github.com/makeTVee/ledskirt as a PlatformIO project.
special version with rainbow color change balls, looks even better ;-)
If you are using RGBW strips instead of RGB strips, you have to change the init parameters for the Neopixels:
RGB: npNeoPixel pixels = npNeoPixel(20, NeoPin, NEO_GRB + NEO_KHZ800, 1.0);
RGBW: npNeoPixel pixels = npNeoPixel(20, NeoPin, NEO_GRBW + NEO_KHZ800, 1.0);