Amazon.com: HJHX Ws2812b LED Matrix 16x16,256 Pixels RGB 5050SMD Full Color Individually Addressable Digital Led Array, Programmable Flexible Led Screen Panel Display Arduino, Raspberry pi for LED RGB Project : Electronics
Medium 16x32 RGB LED matrix panel - 6mm Pitch : ID 420 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: SunFounder Full Color RGB LED Matrix Driver Shield + RGB Matrix Screen Compatible with Arduino : Electronics
16×16 Dot Matrix LED Display Module – ElectroDragon
Arduino WS2812B Tutorial (16x16 256 LED Test) - YouTube