[Although "Court" is a bit of a misnomer for all three; none of them are very organised bodies, and the term's applied because it's applied to the more familiar types]
Grey Court:
(Yeah, I know, everyone uses Grey; but there aren't that many colours that seem vampiric).
Like the White Court, the Grey Court is made up of families which propgate by interbreeding with humans. They are similar in another respect too, in that they are living beings who access their supernatural power by feeding - and attunement with spirits of hunger - although in the Grey Court's case, this feeding is on blood. Grey Court vampires resemble normal humans by day, during which time they are also deprived of most of their power - only at night do they take on their full strength and hunger, together with a much less human appearance - their nocturnal forms have bluish skin and features halfway between a rat and a rotted corpse. Within a Grey Court family, all the vampires are of one gender - when they have children with humans, the children of that gender will be vampires, the others human. How Grey Court families treat their humans varies widely - anything from slaves, to favoured pets, to respected retainers, to near equal lovers can be found. Most Grey Court vampires are also magical practitioners (almost always Ritual; the spirits within them tend to go haywire under the raw power of Channelling). Grey Court families usually ignore one another unless one poses a problem for the other. They extend the same attitude to other vampires, which is why they don't have any prominence in the dealings of the Courts. Some have been found on each side of the vampire war.
(Essentially, a way to get the "human by day, monster by night" and "bloodsucking witch" types into a Dresden-style Court).
Human Form (they assume their supernatural form at night, and are human by day) and Feeding Dependency. These affect the following: Fangs, Inhuman Stength, one of Inhuman Recovery or Toughness (the Catch is symbols and trinkets holy to the human side of their heritage), and Blood Drinker.
They have the Sight in both forms. If they have Rituals, they have this in both forms as well.
Minimum Refresh cost: -4, -6 if they have Rituals.
Green Court:
The Green Court are among the most territorial of all vampires, because it's literally territory they feed on - they leech the vitality out of their surroundings, affecting people, livestock, crops, and all. Rather than feeding physically, they drain an area through their auras, spreading their own diseased energy into the land itself. The presence of a brood of Green Court vampires is marked by an increased in stillbirths and wasing illness. Green Court vampires resemble emaciated and plague-stricken corpses, and are preternaturally stealthy (no physical slouches either). They haunt an area in broods of a half dozen or so, together or in various underground boltholes. They reproduce by "injecting" their energy into the bodies of those killed by their feeding - they are purely inhuman, with no memory or spirit of the victim remaining - and as might be expected, they're irredeemably nasty. Most can't meaningfully communicate with those outside the Court, though a few learn the languages of the people around them - they have no dealings with other vampires, and indeed tend to be hunted out when discovered by the rest of the Courts as they mess up the whole area in ways troublesome for other predators.
(Based on vampire-as-disease of course, most especially a couple of African legends).
Feeding Dependency, which affects every other ability.
Living Dead, Cloak of Shadows, Psychometry (works on locations rather than portable objects), Gaseous Form, Inhuman Strength, Inhuman Recovery and Supernatural Toughness (the Catches are healing and healthful herbs like garlic, or being wounded with wooden weapons).
They also have "Area Drinker," which I made a -4. Each day, they roll Conviction to feed on the life forces of the area around them - this affects a radius in zones equal to ten times the numberical value of the numerical value of the result on the ladder - the affected area takes on an Aspect of "Depleted," which can be compelled and invoked to cause illness and decreptitude, and against the healing of physical consequences suffered by inhabitants (inhabitant being defined as someone who last slept in the affected area). The effect is cumulative if multiple vampires feed.
Refresh cost: -15.
The Pale Court:
Pale Court vampires are spectral entities (although some can manifest themselves physically) that feed on emotional and vital force, usually on sleeping victims. They do apparently begin as ghosts, since they remember a mortal life before their current existences - how they turn from normal ghost into Pale Court vampire is subject to some conjecture in magical circles - but the White Council usually puts it down to necromancers seeking a more capable and freer roaming servant than the average ghost (and which then gets away from them through those same attributes). What is known is that Pale Court vampires have gained or regained a level of coherent sapience, which is maintained as long as they continue to feed - should they go without, they begin to revert to the autonomic condition of the average ghost.
(The hungry ghost niche obviously).
Ghost Speaker, Spirit Form, Physical Immunity (the catch comprises the same sorts of things that harm ghosts, which I made +2, as research can turn them up fairly easily; they do not get the protection that an attacker needs to gain their acknowledgment in order to affect them). They also have Manipulate Dream and Dream Vampirism (see below). And they have Feeding Dependency, although rather than affecting their powers, it affects their sapience and free will.
Refresh Cost: -12.
Manipulate Dream -2: This power allows a creature to incite or alter a target's dreams. In general, this is a contest of Deceit vs the victim's Discipline - success allows the creature to lay an Aspect on the dreamscape, which can be tagged or invoked to ease further manipulations, or the use of other powers such as Dream Vampirism. Aspects on dreams can be environmental ("everything grows dark"), emotional ("everything is inexplicably frightening"), or an incorporated element or monster ("beware the jabberwock"). [Mortals can take a Lucid Dreaming stunt for Discipline, which allows them to use this power on their own dreams, which counters the manipulations of others]
Dream Vampirism -1: This is carried out using the same system as Emotion Feeding, using the vampire's Decit vs the victim's Discipline - as the name implies, it can only be used on a target who is currently dreaming - however, any Aspects laid on a dream by the Manipulate Dream power can be tagged or invoked to benefit feeding. Some Dream vampires draw on emotional energy, while some siphon life force more directly - the only mechanical difference is that the former inflicts psychological stress and the latter physical - decide which one this vampire does.
Some Pale Court vampires have Domination, Incite Emotion, and/or the Poltergeist enhancement to Spirit Form.