I really love the CLEDMatrix class of Aaron and use it in many projects - for my new project I have a matrix based on 4 panels.
But with the CLEDMatrix I can not address all my panels within one matrix. So I decided to port the Adafruit_NeoMatrix and Adafruit_GFX library to FastLED.
Feel free to test and modify it. Source is really under development.
With this little libraries it is possible to build a giant matrix with different tiles (in my case LED matrix panels)
