I've been working on a short story for a few weeks now - from idea to actually writing it down in my notebook, and I've found that having this little short tale in between working on two mammoth (in my case) projects has been mentally and creatively refreshing.
Think about it. You just got done writing and editing upwards of 50,000 words. That's not chump change! My novel wasn't as long as many other romance books simply because it is written in the third person and follows a few different POV characters. A lot of the longer books I've seen are written in the first person and only show the view of the heroine. That's something I'd like to try sometime soon, but for now, I'm focused on this short story.
Working on a short piece forces you to hone your storytelling craft. Do your beginning, middle, and end all work? What about character? Are you getting the most out of these people in the short amount of time you have? These are great things to practice. I used to do a lot of short films and, let me just say, the story structure was and still is essential to any short narrative. It can't be about nothing. It has to have a precise goal and you have to hit it. We'll see if I do once it's published!
Give writing one of these 7,500 pieces a shot. Who knows? With eBooks, short stories are finding a new life.