I always associate brown with the Jedi to be entirely honest [more specifically Gray Jedi. The Jedi's robes are traditionally brown. The Sith are associated with the color black (and obviously red) which itself is synonymous with darkness, hatred, evil etc. Having a Sith based alliance on the Brown sphere is, in my eyes, an oxymoron. An alliance of Gray Jedi would make more sense there .-.
Peace is a lie, there is only passion.
Through passion, I gain strength.
Through strength, I gain power.
Through power, I gain victory.
Through victory, my chains are broken.
The Force shall free me.