Wannabe inventors, here's your chance to make the concept iPhone accessory you thought up one sleepless night a reality — and in record time. Two startups, Quirky and Fab, want to change the future of product development and retail, beginning with the new iPhone 5. Act fast, because until today, Sept. 13, at 7 p.m. ET, you can submit your idea for an Apple accessory that will then be posted on the Fab and Quirky websites for members and customers to vote on as their favorite.Within 24 hours, the winning designs will be sketched, rendered, sent into production, and next week sold as a final product in Fab's online shop. What iPhone accessory would you love to see come to life?