With this command block contraption that I made 100% no-one else, I have made a device that uses RGB to the max, it uses a board and a couple teams to make RGB in minecraft :D Try it out for yourself :D
This is not a schematic, Because it uses certain co-ordinates, if you find any bugs report it to Benwager12 no-one else unless they have studied it and knows how it works :)

I have got a update: 1.1: The fill update, the new save :D My sister asked me how I could make all of it red super fast, so I added a simple hotbar slot since I had 3 available, the stained glass, hover over them to fill the canvas, I have tested this and so far it works GREAT!
Sorry for the short post, I have limited time to type this  Benwager12 Signing out :D