Hmm. Lemme get back to you on this after school. I've got a bunch of Chaos, Marine, Eldar, and Steel Legion...
EDIT: Right, here I go....
First off, His Imperial Majesty's Marines, the Adeptus Astartes!
The Holy Chapter of the Star-Lord's Men:
A detachment of the Raven Guard which looted some armour from the heretics.... one hopes its effects aren't lasting...
And that, sadly, is about it; I'm not a huge Marines player.
Then, the forces of Chaos, the heretics, the Traitor Legions:
The Legios Manzikert.
Tzeentch's Ninja!
A very Khornate force, the Qa'pla:
And a Slaneesh-corrupted branch of the Nurgle Death Guard:
The Steel Legion of Armageddon has many regiments, of which these are but a few...
Red Hot and Blue, named after a chain of restaurants which is sadly disappearing.
Ravengers-- a regiment which skirts the boundary of heresy on occasion, but fights so well they need red coats in order to hide the blood splatters...
Snow forces, the Echo Base Third Legion:
Yavaennor, a regiment that often works with a nearby Craftworld:
Then, two regiments which have tragically turned to heresy...
The First Traitor Guard:
And Slan's Bitches... a most obnoxious paint scheme which even extends to the holy Leman Russ:
Then we have the xenos Eldar:
The Guardians of the Aran. It is speculated that 'Aran' may be a craftworld yet unknown; or it could be a new xenos leader. Memo to the Officio Assassinorum: Investigate this promptly.
Enjoy...