My ideas often come from strong mental images. When I'm observing some relatively ordinary thing, I'll think, "What if...." and out of that brainstorming a story emerges.
Cassandra ClareSo John took out of his pocket A knife both long and sharp, And stuck it through his brother's heart, And the blood came pouring down. Says John to William, "Take off thy shirt, And tear it from gore to gore, And wrap it round your bleeding heart, And the blood will pour no more.
Cassandra ClareMagnus, you were trying to flirt with your own plate." "I'm a very open-minded sort of fellow!
Cassandra ClareA lot of people feel like urban fantasy is a shortcut that gets you around world-building, because it's set "in the real world." But it doesn't really work that way, as I found out. You have to come up with just as consistent an internal cosmology and magic system as you would if you were writing high fantasy.
Cassandra Clare