For a chaos "count as" army, I was planning on using the Bonne Family from Mega Man Legends as a theme. Heres what I have so far

Terminator Lord - Tensil (sp?)
Sorc - Tron
Dreadnaught - Bonn Bonne

CSMs/Havocs/etc - Servbots
Noise Marines - Coked out lookin eyes, guitars, mohawks, speakers built into chest, obnoxious rave colors
Zerkers - DX face, axes about as big as their entire body
Plauge Marines - Pales, wide white eyes, drooling, flamers (slimers) w/ biohazard barrels on back

Defiler - Big Octopus Bot from MegaMan Legends

Tanks of course will be obnoxiously curvy and cartoony

Terminator - The Gustav

MoT - Armor Plated
MoK - Spikey
MoS - Some kinda jet booster/roller skates, open to suggestions
MoN - No Idea

And for those wondering, I will be using actual lego heads for the servebots

Any suggestions/tips?