I have used an old classroom style 6x6 foot Da Lite model B and extended the sides with none other than white construction paper. It works pretty seemlessly. There seems to be minimal difference in gain. And the gain seems to be fairly average. My projector is pretty old and dim (Sharp XG-H440U- no projector central does NOT have an entry for this one; I was looking at the XG-H400U on projector central which is worse than mine once and thought it was mine; i realized it when I looked at the power consumption of mine which was greater and they look a little different). Anyway it's very old. Not that I would ever use a bed sheet for a projection screen but I know people do so it would be good information to have here for other people to see. Finally, white paint. No specail HT paint, regular white oil paint people have on the outside of their houses or on their walls. Also post other household things people use for screens. Mostly I am concerned with white paper and possibly my old Da Lite Model B (very old; it's got the brown hex-shaped rollup thing at the top and it's square; 6x6 feet); there is a picture of it on my profile; it's my profile picture.