Especially when starting out, experimenting with different kinds of writing is a great idea as it will help you find your niche. Later, when you have discovered what that niche is, you can hone it and playing with form is a fantastic way of doing that honing. Also, if you write flash fiction, as I do, there's nothing to stop you having a go at the standard length short story (which I also do from time to time).
The watchword here is to have fun with your writing. Sometimes give yourself a break from what you usually do and be creative in other writing fields. At worst, it'll act as a brief break and you'll find you really do want to stick to what you usually do. At best, you'll find a whole new world of writing to enjoy. This is what happened to me with flash fiction and I've ended up being published in it! So be open!