Make a simple mosquito net using marbles and string. Take a section of mosquito netting the olive mosquito netting http://shop.vtarmynavy.com/olive-insect-netting-p11240.aspx from insect netting specials is perfect http://shop.vtarmynavy.com/insect-netting-specials-c832.aspx. The size of this section is 70 inches by 108 inches.
Using marbles you can made quick tie points by wrapping the string around the marble and tying off the net at strategic points. You could tie off on four corners like the traditional nets or get the netting above your head an let it drape down towards you legs.