Mechs--that's all I can say. I'm working on a currently basic mod which will at some point be relatively complex and interesting, I think. Right now it only replaces the GDR with 6 different "classes" of mechs in attempt to base it on the late game, Chromehounds, but obviously reusing the GDR graphics is a little--lame.
I'm far from picky, I would make use of any unique mech graphics, but if anyone ever got around to doing something similar to the following I'd be very appreciative:
The Treaded chassis was used for several classes of mechs, primarily for soldiers, defenders, heavy gunners and commanders.
Treaded1
Treaded2
Treaded3
Treaded4
Treaded5
The wheeled chassis was mostly used for scouts but light soldiers also could make use of them.
Wheeled1
Wheeled2
Wheeled3
Wheeled4
Wheeled5
The multi-leg chassis was basically for your heavy gunners but occasionally for commanders as well.
Multi-Leg1
Multi-Leg2
Multi-Leg3
Multi-Leg4
Multi-Leg5
Commanders are the ones with the huge "satellite" arrays on their tops which granted that mech the ability to see mostly everything on the battlefield and relay that info to its squad mates.
Commander1
Commander2
Commander3
Commander4
Commander5
The hover chassis was mostly used for scouts, obviously.
Hover1
Hover2
Hover3
Hover4
But yeah, these are simply some examples from the game. I'd take just about anything anyone was willing to do