silly things like Ungors/gors, Minotaurs and what ever the boss Minotaur is...Doombull(?). I'll make a shirtless chaos horde one day! Chaos Ogres, Chaos Marauders, Ungors/gors, Minotaurs... maybe some demons too. Magic? nah. Just a bunch of crazy troopers.
with 40k its best to get the rules straight then apply imagination and rationalize; you will only get annoyed doing it the other way round
~Bullymike