So quite recently I picked up Heavy Gear having played the video games back in middle school in the late 90's after my store started stocking it, picking up a force both of the Northern Guard and Southern Republican Army.
For the Northern Guard I decided to go with a very sort of Tattooine-ey worn/weathered look, with a couple patches of Teal for regimental markings, and to paint theem I picked up the recent Heavy Gear Blitz Reaper Master Series paint set.
Primarily this consisted of a couple of coats of Terranova Tundra over black primer, most of the metal bits done in Durasheet Alloy and the armor scratches/scoring done with Skunkwerks Gunmetal applied with spare foam from a carrying case and then lightly gone over again with Durasheet Alloy for some gradient. Then I pretty much just drowned them in Gryphonne Sepia (or whatever they're calling it now) wash.
Here are the two Northern Guard models I have done so far (warning: my camera sucks and I'm bad at pictures )