For all of the blocks that you can use dye on - concrete, glass, wool, terracotta, etc, allow a second dying to enable the same color range as dyed leather. So you would put 8 blocks of blue concrete with a cyan dye and get 8 blocks of teal concrete. https://minecraft.gamepedia.com/File:Dyegraph.png Yes it's frivolous, but hey people might like it?
Maybe you didn't know this. But Minecraft doesn't have transferred concrete. https://minecraft.gamepedia.com/Concrete And we are not looking to require texture packs at this point. Suggestion denied...
