The Lancers paint their equipment a standard, gray-tinted green. The First Lancers formerly highlighted their 'Mechs and vehicles in yellow but have since replaced it with ivory to avoid infringing on the use of gold as a mark of the Chancellor's special favor.
Per FM:Capellan Confederation, page 104.
Cataphract, FM:Capellan Confederation (plate 5)
Emperor, Classic Battletech Master Rules Revised Edition (plate 8)
Jinggau, CB: Miniatures Rules (p 20)
The St. Ives Armored Cavalry divisional insignia is an orange sunburst set against an inverted blue double pyramid. The St. Ives Armored Cavalry prominently displays the crest of the St. Ives Commonality on BattleMechs and other machines.
The First St. Ivers Lancers' insignia shows a rearing white horse wearing a crown, set against a green field.
Per FM:Capellan Confederation, pages 103 and 104.