Have you ever thought to put your desk in the nursery? This can be a good use of space provided that you can have enough time to use it there :)
Clever use of space is this one, too, but notice how fresh and inviting it looks: Great design - both, as use of space and colour choices, and as design of furniture!
There is another one, not so unusual according to me, place for your desk, suggested by Dwell:
I have my desk near the kitchen, too - this is a flexible way to combine obligations at home with professional tasks. And a great solution if that is the only spare space available, too.
How do you like them?
