No thanks to Bob Crow's sanctioned terrorists holding the capital to ransom this week (i.e. tube drivers) some lucky people are getting to work from home. Alas, not everyone has a separate room with which they can distance home life, from their working life.
To aid this, I suggest customizing your desktop differently on home and work PC's. You might also like to have an extra desktop configuration for your home PC, when doing personal work. In this way, you can create a distinction in your mind about whether you're working or playing. And in turn this stops the perceived monotony when working from home.