We've covered what sorts of material you should design. We've talked about personalizing your game to involve your players more deeply. We've discussed how you can make commercial campaigns work for you instead of the other way around. In a moment I'll go into detail about a number of different methods. Random association is the process of looking at one thing and allowing your mind to wander over whatever that thing makes you think of.
Random association is the key ingredient in a number of plot recipes.
So take a few minutes to walk around your house or web surf. Look at pieces of artwork or read headlines. It only takes a little practice before you're spouting out plots with the best of 'em. You might use an entire song, or a verse from a song, to create a person. Song lyrics are particularly good for creating characters as they often detail people, their actions, and their emotions.