Laura Heller There are so many things that go into making a good screening surface. The proper color, reflective properties, how it portrays a true black. It's hard enough to pick a wall paint, let alone one that truly portrays a moving image in high def. There are lower cost options from Behr, but if you've got the time and dedication to try a DIY option check out this review at Projector Central. They're super high on a Sherwin Williams option, but it's not as simple as just painting the wall with paint from a can. At least not for good quality results.
http://www.projectorcentral.com/paint_perfect_screen_$100.htm

jamiestar have you ever created a wooden outdoor movie screen before?

Laura Heller Absolutely, that's what it was meant for....