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One can take any of the different Chaos marine types as troops, regardless of what Mark your commander has. I really like that dynamic, because it allows people to make a themed force, but still take whatever they want. Obviously, though, taking Plague Marines in a Slaaneshi force doesn't make much sense, so I've been doing some thinking on ways to justify these units under certain themes.

Khorne/World Eaters Force
Noise Marines: While Khorne demands blood and skulls for his throne, he cares not how they are acquired. Most of the Blood God's servants close with the enemy to personally take these prizes, but there are a rare view who prefer to see a wide view of battle, to watch as much death and carnage as possible and to cause it to anyone at any time. These marines use massive, crude weapons of brass and iron that fire deadly rockets, burning fuel, and metal shards into the enemy, with the intent to cause the most spectacular displays of death, though they do not hesitate to engage in the swirl of close combat when the time is right. The battlefields they visit are filled with the sound of their maniacal laughter as they scythe down all before them.
Plague Marines: The furious warriors of Khorne know nothing of pain except what they inflict, but there are those that take this to another level altogether. Khorne normally never allows his servants a respite from death, not wanting to lose a drop of blood regardless of whose side they were on, but the prayers of his devoted servants, near to death, begging for a chance to take just one more life, sometimes reach his ears. Those blessed as such can survive any death, and will continue forward no matter the injury so long as they still have a chance at killing another foe. Torn to pieces by the wounds of hundreds of battles, they rarely make effective combatants anymore, slowed by torn muscle and damaged nerves, but they must fight on through the agony forever to fulfill their promise to Khorne. However, the Blood God has forever abandoned their skull's place in His throne, denying the bloodied servant his ultimate reward. Never is it claimed that Khorne is merciful.
Rubic Marines: Not all of Khorne's followers indulge in complete bloodlust. Khorne knows that violence takes many myriad forms and that the cool determination of the professional soldier is just as effective in collecting skulls as the blood-crazed berserker, and Khorne will reward any that bring violent death. While most of Khorne's follows bowed to His throne from their love of bloodshed, some were swayed to his ways by their apathy for life and indifference to murder, soldiers that turned killing into a brutal art with no concern to the lives they took. In His service they advance, cool and collected, letting their brethren run to the enemy knowing that in Khorne's name their will always be more to slay. They employ their enhanced weapons with deadly precision and lay the remains in front of the Skull of Thrones. Khorne watches over these servants with interest, and channels His rage through their champions, always eager to see new ways of bringing death.

Nurgle/Death Guard
Berserkers: There are those in the legions of Nurgle that take a proactive approach to the spread of the Unclean One's blessings. Armed with great scythes and infected with the most potent of maladies, these servants throw themselves at the foe, wheezing laugher seeping from their breathing gear as they inflict death upon their foe, leaving their vivisected bodies to decay under Nurgle's blessings. They wish for nothing more than to watch their patron's work as close as possible and ensure that infection is spread directly to those that need it most.
Noise Marines: Nurgle is not normally an enthusiast for science, but when the opportunity presents itself to spread His cancerous work in new ways, He is willing to allow a meager amount of progress in the name of greater decay. Genetically engineered viruses, prions that can destroy flesh with startling ease, bacteria that clog the orifices of the foe, these are packed into glass spheres and projected at the foe by a variety of means, allowing the pandemic to spread in new and deadly fashion.
Rubic Marines: Not all of Nurgle's devoted children develop the same way. Most cry out to Grandfather Nurgle in desperation, to end their suffering, but others find different ways to His service. The Apothecaries of Renegade Space Marines often find themselves in His service when they beg Him to spare their patients, a situation Nurgle relishes for it's delicious irony. He corrupts them into His service, taking from them their bodies and their will, and forcing them to spread his plagues with needle-rifle and hypo-gun, accompanied at all times by rolling clouds of lethal bacterium. They are unmarked by Nurgle's blessings, their white armour still shining under the fog of decaying matter, but their minds are twisted and tortured by their constant mental battle against Nurgle's control. Despite their struggles against the horror they spread, their will is nothing compared to that of Grandfather Nurgle, and though they may slow, they never stop in their compulsion to serve him, until their will is totally broken and they succumb to his blessings.

Slaanesh/Emperor's Children
Berserkers: Death an extreme experience both to go through and to inflict. Many of those in the service of the Prince of Pleasure find a sort of perverse interest in watching death, looking into the eyes as the soul flees the mortal world with rapt attention. These psychopathic death-dealers use a variety of strange and frightening weapons in their murderous work, stealing the life of their foes from as close as possible to savor every element of the deed.
Plague Marines: Pain is one of the harshest sensations that sentient beings can undergo, so it is no surprise that those devoted to Slaanesh often seek it out. These particularly disturbed individuals grow their tolerance for pain to levels far beyond the human norm, while the blessings of the Dark Prince build upon their body to allow them to survive the wounds that they inflict upon themselves. They rush into combat and fire their weapons to draw the attention of the enemy guns, hoping for a barrage of firepower painful enough to send them straight to the arms of She who Thirsts.
Rubic Marines: There is but one ultimate fate for the servants of Slaanesh, other than the oblivion of spawnhood, death in battle or ascension to daemonhood. There is a limit to the abilities of the senses, and eventually the tolerances of the Marine overcomes these limitations and leaves the devotee in a terrifying netherworld where no sensation can evoke a response. The world is a blur of gray, sounds seem distant and hollow, and no drug can stir the shattered synapses of their twisted mind. Shattered and unresponsive, they stumble through the actions of their former life with a half-hearted enthusiasm, always looking for an experience that can once again register to their withered senses. Slaanesh hates to see Her playthings so depressed, manifesting His power into them with the hopes of restoring them to life, but recovery is rare and the depraved Prince rarely has the patience to assist them for long.

Tzeentch/Thousand Sons
Berserkers: Being not but dust and sustained only by the will of their leaders, Rubic Marines can find themselves the playthings of daemonic powers when outside the influence of their sorcerers. Their souls unable to resist the power of the creatures on the other side of the Veil, daemons will force themselves into the bodies of these former marines, and reviling in their invincible shells, will launch themselves into combat with abandon, taking in as much of the mortal world as possible and tearing apart their living foes with ease.
Plague Marines: Those Rubic Marines will a semblance of will found themselves in a horrifying half-world, with their will intact but their bodies shattered into sand and glass. Their existence is a terrible curse, and in battle this soldiers seek nothing but death at the hands of their foes. However, their crystallized bodies inside their shells cannot feel pain and are nearly invincible, and they are often disappointed in their quest by their robust forms. Even when struck down, they reconstitute their forms, their armour sealing them in for an eternal existence of terrible pain.
Noise Marines: Not all the sorcerers of the Thousand Sons see the automatons that accompany them as their former comrades. Some very ruthless ones use the armour and bodies of their former squadmates as psychic amplifiers, channeling their considerable mental powers into terrible bursts of power that rends the enemies of Tzeentch apart. Sacrificing their considerable wards and protection for further offensive power, each Rubic Marine becomes little more than a weapon slaved to the sorcerer. Such individuals are somewhat loathed in the Thousand's Sons, but tolerated due to their undeniable effectiveness.

Sounds comprehensive, and feasible to me. I'm sure most players will take it upon themselves to justify contrasting units, whether it be with pre-written fluff or simply a strong love of differring powers.

I'm working on Thousand Sons, but I never thought it impossible to suggest that the legion has its own beserkers for example. I think Plague Marines and Noise Marines would require further justification, but I reckon with some modelled unity (some continuous constant, i.e all my Thousand Sons have Chaos Warrior helmets, which will be on all squads), enemy players should be more than happy to recognise the time you have taken to cover all your background loopholes.

I really like pure armies, but this is Chaos we are playing, after all. Good thread.