How can I create a simple case for my Raspberry Pi?
I don't need an airtight case; I'm looking for a simple and cheap case, just to be sure no one touches the circuit board.
The easiest and cheapest case must be The Punnet; it is a case made from cardboard. You can download a PDF, print it onto your favourite coloured cardboard, cut it out and stick it together.
Of course, if you have any Lego hanging around that's another easy solution.
In fact, there was an article on the front page of the Raspberry Pi homepage detailing just that: http://www.raspberrypi.org/archives/1354