Breadboard-friendly RGB Smart NeoPixel - Pack of 4 : ID 1312 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Tweaking4All.com - Arduino - LEDStrip effects for NeoPixel and FastLED
WS2812 Addressable RGB LED Stick Module - ProtoSupplies
Arduino Knight Rider LEDs (Cylon Eye) - The Geek Pub
Amazon.com: Stemedu 2PCS 8 Bits LED Ring, WS2812B 5050 RGB LED Pixel Lamp , DC 5V Low Power, Full Magic Color, Individually Addressable 8 LEDs Light Circle with Integrated Driver for Arduino
GitHub - technobly/NeoPixel-KnightRider: A highly configurable Knight Rider (larson display) routine for your AdaFruit NeoPixel (WS2812 RGB LED) using the Arduino.