Trash Alert the Game

So I'm not feeling super creative lately, but I recently developed a nice frame work for a Command and Conquer like RTS system. My struggle has been thinking of good factions and good unique units for those factions. So I figured why not ask the community!

My basic idea is Trash People vs Stellas. Essentially Stellas (Hollywood Disco types) have taken over the world and a collection group of Trash People are waging a war to fight and take back the world in the name of Trash. The two sides will each have a couple of sub-factions with each sub-faction having one or more specialty units specific to them. Any ideas are welcome.