curtain to cover underneath loft

[shwan.livejournal.com]

I plan on having a loft in my dorm room again this coming year, but this time I think I want to put some sort of curtain hanging down from one of the long sides of the bed (the other side will be against the wall), just for fun and to create a little hideout underneath the bed where my futon will be. I'd like for it to either be able to be slid across or pulled back for when I just want to be on the futon, though. I can't exactly figure out the cheapest, easiest way to do this. It would have to be the length of a normal twin size bed and about five and a half feet tall. I was thinking of using some kind of beaded curtains, but none of them are that wide...and then I thought of maybe using a sheet turned on it's side, but I don't really know how that would work out. I don't have a sewing machine, so anything with complicated sewing wouldn't really work...but does anyone have any cheap ideas?