Measure the width and length of the room with a measuring tape. The length of the fabric should be the length of the room plus an additional fourth of that measurement to allow enough fabric for draping. Multiply the width times 2 to determine the amount of fabric you need to cover the ceiling area, and divide that number by the width of fabric on the bolt to calculate how many pieces, or panels, of fabric you need.
Select a thin fabric that gathers easily--satin, silk or chiffon are good choices. Pick a neutral color for a softening effect or a bold color to add drama.
Use a hammer to install thin curtain rods on opposite walls of the room. Place the rods near the ceiling.
Sew a 1/2-inch seam around all sides of the fabric for a finished appearance. Fold the fabric at over each end of the panel and sew a 1-inch pocket the full width of the fabric. Repeat until all fabric panels have been finished.
Guide a curtain rod through a pocket on one end of the fabric. Slide the opposite end of the fabric onto a curtain rod on the other side of the room to drape the fabric across the room. Repeat until all fabric panels are hung.