Australian publisher Tiny Owl Workshop has come up with an interesting project called "The Lane of Unusual Traders". This is a world building project and all the details you need to get started are on the site. To build this world they need flash fiction up to 500 words and shorts of 1500 to 3000 words in any genre. The deadline for flash is July 31 and payment is $60AUD for shorts the deadline is August 31 and payment is $300 AUD. You can find all the details here.
Hat tip to the literarium blog!