Above is the Dust Giants variant of the Colossus. This was a pain to redo since the Blind Legion one hates spawning.
Sky Burners:
Sand Eaters
Blind Legion
Siege Dancers
Unknown Legion
Generic

Valus Ta'aurc

XBOX 360/PS3 Variants
Colossus (DG, SE, BL, SD)

"Where a Colossus stands, many will fall."

Towering over other Cabal, equipped with rapid-firing heavy weapons
and nearly impenetrable armor, the Colossus is the most devastating
heavy infantry unit in the Cabal order of battle.

Source:http://db.destinytracker.com/grimoire/enemies/cabal/colossus

UPDATE 1/6/22 - Added mohawk to Skyburners variant. Added Unknown Legion variant.

UPDATE 1/11/22 - Renamed unique variant to generic.

UPDATE 7/23/22 - Added Colossus variants based on their adjusted appearance on older console generations.

UPDATE 5/9/23 - Changed suit color for Unknown Legion Colossus