The Lone Star Regiment paints its BattleMechs rust brown with tan highlights.

Per FM: Merc (revised), page 88.

Other references:
Hunchback, FM: Mercenaries Revised (plate 8)
Banshee, CM: Mercenaries (p 110)


Insignia:

Its insignia is a Cameron Star pointing downward on a white shield trimmed in yellow-gold. Per FM:Mercenaries Revised, page 88.