Deathstrike Galaxy warriors paint their 'Mechs dark blue with black trim.
Per FM: Warden Clans, page 68.
Grendel, FM: Warden Clans (plate 4)
The Clan Diamond Shark insignia is displayed on all war machines in the Clan Touman. Galaxy insignias may be painted on a 'Mech or fighter, but always lower and smaller than the Clan insignia. Warriors with at least one confirmed kill may paint shark-like teeth in an appropriate place: the nose of a fighter, cockpit of a 'Mech, front of a vehicle or faceplate of battle armor.
The Galaxy insignia is a diamond shark swimming out of a diamond-shaped field of stars.
Per FM: Warden Clans, pages 66 and 68.