This site has a monthly short story competition with varying word counts and a different word of phrase to be incorporated. There's a €10 prize, plus the winner and their story will be feature on the website and on social media.
The word count for September is 900 and the key word is chocolate. I don't grow pumpkins and I've eaten all the chocolate, but I can always do purple. These are autumn crocus.
Purple Pumkin are also open to a wide variety of book submissions.