Adafruit customer,Chris Cantrell used the NeoPixel NeoMatrix 8×8 for his NeoPixel Driver for the Parallax Propeller
This driver generates the high-frequency data protocol required to talk to a line of NeoPixel RGB LEDs (I used the following 8×8 NeoPixel grid from AdaFruit: https://www.adafruit.com/products/1487). The driver reads pixel data from a pixel buffer in shared memory.
One driver COG can update several lines of NeoPixels. Or separate driver COGS can be spun up to manage each NeoPixel line.