One package of 9ft by 12ft drop cloth (found at Lowes)
Ok so you have a whole lot of fabric here. You are going to cut into four equal panels cutting from the 12 ft side. So you should have four 36in wide panels that are 9ft long (108in). Or you could make the panels wider if say you only need two of them.
Fold over top 5 inches, iron down, and sew in place
Put on curtain rod and measure where you need to cut. Cut off excess, leaving about two inches to hem up.
Relish in the fact you just spent $4.75 for four gorgeous curtains! Shhhh don't tell anyone ;)
Check out how I made the shelving units the curtains are hanging from HERE
Check out where I PARTY