What I used: two canvases (75cm x 100cm each), 2.5m burlap, assorted brackets and screws, picture wire, 3M hooks, staples and a staple gun.
We found the 2 canvases for super cheap at "the reject shop", and then Patrick attached them with brackets, and strung picture wire tightly across:
Then I covered it with burlap fabric, with some help from my assistant:
And here's the before and after (disregard the messy bed):
It's nothing special, but it'll do!