We've featured DIY projector screens before, but as DIY projects go they can still get a bit pricey. If you have a nice, flat wall, you can use this method to create a great screen on the cheap.
YouTube DIYer LouTube222 demonstrates the process in the video above. Essentially, you just paint your wall really white and create a wood and velvet frame to add a border. This gives the illusion of an actual screen fixed to your wall with far less stuff to build and mount. Pretty cool!
A fifty-dollar project screen you can be proud of [Hack-a-Day]