Mac :: Stand That Will Hold Screen Vertical

I'm considering buying/making a stand for my MBP but have limited desk space, so what I ideally want is a stand which will hold my laptop, fully opened, with its screen completely vertical against, say, the wall behind my desk. If this is hard to imagine, think of it this way: say you're looking at the laptop from the right hand side, in it's normal open position it makes a kind of '9-o-clock' shape with the screen perfectly vertical and the keys perfectly horizontal. I'm looking for more of a '7-o-clock' but where the screen is raised to eye level, whilst still perfectly vertical