See, I
like the greenish tint to the cyan.
I think it looks great next to sandstone (ala T's place downtown) and should fit with the cactus green nicely.
I tried both the grey and light light grey next to the brown, and they both look like butt.
So the 6th floor is now light grey+grey. Looks nice, I think. I may try to add some brown to the black on the 7th floor depending on how much area there is.