My biggest accidental army was definitely Cybertronic. I had a handful of the basic troopers and a few scattered chausseurs. Somehow as I accumulated more figs for other armies I always ended up with a cyber-fella here of there. Then I invested in some Mirrormen, and I loved the idea of these guys so much I dove in whole hog. Now I have a rather large punitive force including 2 units of peoples, 5 units of chausseurs, 2 units of shock troopers, 2 units of mirrormen, 3 units of mk I's, 1 unit Mk II's, 2 units of Attillas, 1 unit of reavers, 2 surveillers, 1 chemiman, 2 scorpions, a home built Cancer, and 2 of the big bad egg droids (oh yeah and assorted and sundry heroes).!
Needless to say, my Brotherhood army is mad at me.
D