Creative Plot Creation is about allowing different players to plan their plots, and asking help to other players with complementing chars.
Imagine I have a blacksmith who believes he's made something pretty value. He has been telling all his friends, but unfortunately when you do that unfriendly people get to know it as well.
Let's call the above situation a plot starter. Or primer, since I study genetics. Well, as PS is sitting, it probably won't happen because at the time it happens there aren't any ruffians around. Still, you'd love it to happen, because it would be fun to roleplay things from there. So, you go to this list, find a ruffian and ask a player if he won't mind to assume his character had the information. That done...
Irdeal, who had heard the conversation between the blacksmith and his friends, began making a plan right away. He summoned his gang and told them they would wait for the blacksmith in an alley. They did so and extracted the item from the blacksmith, who didn't want to get beaten.
But the blacksmith hasn't said his last word. Together with his friends they try to go after the members he remember were in the gang... while the bandits try to sell the item to someone.
Got it now? It's just a way to facilitate the complementation of characters.