The three Arkab Legions paint their 'Mechs in tans and dark greens.
Per FM:Draconis Combine, page 100.
The Legion crest is a six-pointed star set against a half-yellow, half-black background. The Legions are not required to bear the dragon crest of House Kurita, though the commanding officer of each Arkab Legion voluntarily paints the dragon insignia on the upper left arm of his BattleMech to show the Azami allegiance to House Kurita. In addition to the Legion insignia, the Fourth Arkab displays an insignia showing an Arabian scimitar with a bloody blade and gold cords dangling from the hilt set against a field of gold and white rays. Per FM: Draconis Combine, pages 100 and 102.