Actually, she has a whole chart, but I couldn't figure out how to format it here. But here's the idea. Kids choose an element from each of the following categories, and their choices prompt the story. Here are her elements, but obviously you can add your own.
Character: a principal with a secret; a lonely child; a man on the run; the class president; a nerd; a very good fisherman; an inventor; a fashion model; a genius
Place: a secret panel; a secondhand shop; enemy territory; Boyle Heights; an amusement park; a burning building; an attic; an abandoned church; San Francisco
Situation: someone screaming for help; hunger and thirst; turning into a grownup; a wedding; caught in the act; betrayed; doing what you shouldn't; a warning
Objects: footprints; a camera; a long ladder; a comfy chair; a found wallet; an umbrella; a bread knife; a cell phone; a keychain with one key; an 1885 silver dollar; a rare stamp; an Ipod; a rabbit's foot
When: it was getting dark; four days ago; during the winter (or summer, spring, fall); bedtime; December (or another month); Valentine's Day; after they came back; while shopping; in 10th grade; at the beginning of summer (or other season)
I will try this!