I converted the Mareus Calgar model slightly to undo all the Ultramarine goodies, skulls were added to the leather straps hanging from the waist, a big 'U' shield was substituted for a spare Skull and Crossbones one on his right pauldron, the Ultramarine symbol on his right gauntlet was filed off and a terminator crux added instead. The 'U' inside the Iron Halo was substituted for a grimacing skull. Only the belt buckle remained,but I just painted the surround gold as well to mask the upper edge. I used a spare MKIII helmet to further differ him from normal Marneus' minis. I think it works well in Grey. The green power cables and the bone colour weapons echo those throughout the rest of my force. Finally a nice purple leaf pattern was added to the edge of the cloak to add some interest. Hope you like.