If you do some searching, you will find a lot of success stories from people who went the DIY route using a big sheet of laminate from Wilsonart. In fact, somebody even posted spectograph (or something) tests suggesting that performance was equal to or sometimes better than many commercial screens costing thousands of dollars.
I am extremely please with the results from my $200 sheet of Wilsonart Designer white. I think a Wilsonart grey color is also recommended as well depending on the brightness of your room.
