The Marik Militias use a color scheme first seen in 2620--purple with red accents on the right side and blue on the left.
Per FM:Free Worlds Legue, page 57.
Each 'Mech displays the Marik Militia crest - a stylized Marik Eagle on a red and blue background - on its left arm or weapons pod. The unit's insignia shows an Orion BattleMech silhouetted against a rising sun. Per FM: Free Worlds League, pages 53 and 57.