I have black Pearlised-card RasPi cases for sale.
The card is 300gsm and folds to form a case without any glue needed.
Cases are £4.50 each including free postage to the UK. Worldwide delivery is available.
Cases available from http://www.raspicases.com/index.html
Shipped in one working day.
You can see a video of the case being folded here
Got a RasPi friend?
Why not send one of these cases as a gift in a Birthday Card. Because the case is flat, when folded in half it easily fits inside an A5 greeting card. Don't have a suitable greetings card? I even suggest some FREE geeky card designs that you can print yourself at the bottom of this page