Well if there's a brown colored cooling liquid, I'd build a brown rig with transparent hard tubing. Together with some RGB lighting set to brown and a nice toilet case mod, it'd be perfect. I'd call it "The Brown Storm".
I'm using the Noctua slim fans on my Kraken X52 AIO, but because they clash with the color scheme of the rest of the build I did a little painting mod on the outer edges.
Perhaps slim Redux fans are up next for a color change?
I've got the industrials with black vibration dampeners and couldn't be happier.
Noctua, you HAVE the technology!
Offer the different colors!
On the other hand the color choice always does differentiate them aside from the excellent performance. You know it's a good product when it's a given the performance is there but you kind of assume the fellow who was responsible for the gray / black bodies/blades was taken out back and shot.