How to make a projector screen for under $100

So you just spent some of your hard earned cash on a nice HD projector, but now you need a screen to go with it. You could spend nearly as much on a projector screen as you spent on your shiny new projector, or you could follow this great DIY write up from the folks at Projector Central, and make you own 100″ diagonal, 16:9 projector screen, for under $100.

Can you tell which image below is being projected on the DIY screen?

The image on the left is the DIY screen.