I've completed a set of utility programs to use a casceded set of WS2812 displays in 2x2, 4x4, 8x8 configurations. You can use this to address larger displays, for instance 3 8x8 displays high and 2 8x8 displays wide. The utility programs containt primitives like plot(x, y, hue) and circle(x, y, radius, hue), but also printchar(c, x, y, hue).
I've put the source and discription on GitHub for anyone to use, comment on and share.
https://github.com/rudiniemeijer/NodeMC ... x-displays