The Lyran Guards use a blue-and-white paint scheme for ceremonial duties.
Per FM: Lyran Alliance, page 74.
The Lyran Guards’ insignia depicts a stylized white horse head that appears on the left leg of BattleMechs or the left side of vehicles. Regimental insignia appear on the right leg or side. The regimental insignia of the Fifth Lyran Guards depicts an Atlas ‘Mech with a world on its shoulders. Per FM:Lyran Alliance, pages 74 and 76.