If you're feeling particularly arty and literary, have a look at the Creative Works competition over at Aesthetica magazine. Deadline 31st August so there's loads of time. Aesthetica is a well-established and respected literary and arts magazine, available from WHSmith or on subscription, or from various art galleries etc.
If you're feeling more like playing with the latest apps on your iphone instead, then here's a site where you can download them for free, in return for writing a brief review. Might be of more interest to your resident teenagers, so feel free to pass this on!
Or if you'd rather stick to writing womag stories - it's time you were getting on with some Christmas themed stories. So what if the sun is shining and you aren't in the mood - that's what a writer's imagination is for!