All you have to do is to write a piece of flash fiction which tells a story directly related to the words "For sale: baby shoes, never worn". OK think sad if you must. But don't limit yourself. Think funny, think every-day, think strange, think way out of the box.
Because the word limit for these stories is 500 words maximum and, in fact, some will be much shorter - I am going to have to collect many many stories in order to be able to fill an entire book. I'm aiming at a minimum of 60,000 words to make it viable. So ... this is a long-term project. At the moment I am thinking possibly a year but may revise that as time goes on. But for now at least, there is no deadline for submissions - and no limit to the number of stories you can submit.
The stories will all be collated and published in a book which will be sold in aid of the Make-A-Wish Foundation UK. So, if you'd like to see your name in print and become a very real part of this project, put on your thinking cap and get writing.