I picked up this suede/faux suede glasses case for £2 earlier - I saw it and thought it was about the right size for an arduino.
I decided to add a power socket and switch, LED and a db15 socket so I can add peripherals.
I was surprised to find it's made of metal, so it's pretty sturdy. It's also pretty roomy - it'll fit a shield without problem.
So far I've added the power socket and switch, but I need to get to bed so I'll finish it off tomorrow. I just wanted to show it off :)