A velvet bedspread from the thrift store can be cut up to make drapes, saving tons of money over buying new drapes or the cost of new fabric. Even a bedspread with a rip or small stain will work by simply cutting them off. Depending on how you drape them, they may not even need hemming.
One Battenburg Lace or plain bedskirt has enough already-gathered material for several window valances (one small and two large windows, or five small windows). Bedskirts can also be found in eyelet or plain in many colors.
Lace tablecloths or bed sheets make wonderful curtains -- so much fabric for so little money.
When stores have bedspreads on sale for $15 to $25, buy two that match. One is for the bed itself, and the other can be made into matching pillows, shams, chair pads, and more.
A quilted bedspread can be made into pot holders and hot pads. The matching sheets can be made into curtains and valances. Together, you can have a totally coordinated kitchen in a much larger selection of colors and styles than what is available in the kitchen department.