Varsovian:
Hm. So, if I may ask, what would you make your Kult stories about? It's a strange game for me - strong setting, but I'm not entirely sure what to do with it...
My favorite was the stereotypical "PC is an artist who gets inspiration from Hell". Watch the player scramble to keep the character alive via all and every method. Watch the character sacrifice various people and then her two adoptive children (which in the first session of the campaign she saved from a child molester in a satisfying manner courtesy of Dice God) in Death rituals to save herself. And fail. She was finally dragged to her Purgatory where all of the above took revenge. "How much do you want to stay alive?"
A number of CSI-themed games, including a memorable one where the PC checked himself into a mental hospital because of mental illness, the other PC mowing through pedestrians with his car, and a car chase into Metropolis with predictable results.
I've run several games using the awesome Jail of Night by Paul Beakley. This crosses over old World of Darkness with KULT. Mage can be used almost unchanged. Vampire is much more fun. Imagine the Ventrue snob finding out that his blood powers are really a record of all the crimes accumulated by his ancestors, and that he will be punished for them. Werewolves are the tragic ones, rejected both by Gaia and the Illusion. (And, Malkuth is the boss of Pentex!) This used the oWoD system, though.
In any case, character motivations are what drove successful stories forward. Players who have a strong idea of what to do will make the game more fun. That's where pbta helps.