Wash cotton or linen lace curtains with detergent to remove any sizing or dust. Rinse well.
Place the curtains in a large pot to see if it will be large enough to hold the curtains. The dry curtains should only fill the pot two-thirds full. There should be enough room for the curtains to move around in the dye.
Heat water to boiling and add 12 standard sized tea bags for each gallon of water. Use more tea if you want a dark shade of beige; use less tea if you want a pale shade.
Place the wet curtains in the dye bath. Keep the liquid hot.
Soak the curtains until the desired shade is achieved. The curtains will lighten as they dry.