2. Citroen C-Cactus

We first saw the quirky C-Cactus at the Frankfurt motor show last year, but time hasn't dulled the outright oddness of it.

The weight - and consequently price - of the C-Cactus has been kept down by using only half the components typically used in a car. Consequently, it looks a bit strange, but it's clever, too.

Man parts having multiple functions: the ignition key, for instance, is also an MP3 player, while the dashboard has been replaced by a central console that controls functions such as the loudspeakers, gearbox controls and navigation system.

In addition, many parts - including the windscreen, windows, door panels and tyres - are made from recycled or recyclable materials.

Chances of seeing it on the road Nil, unless you count seeing the recycled parts in their previous life littering the gutter.