Great tip!!!! Buy tablecloths to use as draperies....much less expensive, already hemmed, meant to launder often, and many patterns and colors available! 60x84 or buy 60x104 so you can hem them AND still have matching fabric left over for pillows or other coordinating pieces!
You can use a fitted sheet to do this, but if you want more color or pattern, upholster your box spring! This is by far the easiest way that I have seen how to do this! No-Sew Upholstered Box Spring - adds great character to the bedroom!