I will write a piece of dark fiction, up to 1,000 words, based on your idea.
Send me an email at firstname.lastname@example.org with the subject "Custom Story" briefly summarizing your idea in 100 words or less. Since this is meant to be a horror story for the Halloween season, please let me know if you want to be the hero or the villain and provide me with a location (preferably your own or some place you always wanted to go but isn't too exotic).
For example, your email may look like this:
I would like a custom story featuring me as the hero, where I’m tormented by the soul of a little girl who died in a fire at my apartment house in Manhattan over thirty years ago.
I would like a custom story featuring me as the villain, in post-apocalyptic California, and it’s a fight for survival to not only defeat healthy survivors of war-torn America but to stay alive from the diseased souls that have been re-animated.
In your message, please state how much you want to pay for this story. I will take submissions from now until October 20, 2012. I will announce the story I have chosen, contact the winner by email and arrange payment. Story will be delivered via email before Halloween.
Winner must agree to allow his story, or part of his story, to be posted at my website.