A few months ago when in Paris I came across a weird little camera Gizmo that a friend of mine was using. It's called the Lens Baby. It's a primitive lens construction consisting of a single lens, a bellows and a Nikon mount. - No aperture, no focus ring, no electronics - nadda.
The results you can get from this thing are astoundingly cool and seriously fun.
For less then 150£ I cannot wait to get my hands on mine.
For more info this is quite a neat little summary:
Here are some results I pulled off the internet just to give an idea of what you can achieve:
Unsurprisingly I love this one :)