I have a friend who purchased 2 twin sized quilts and hung them with clips from a rod as a window treatment for her sliding glass doors....it is really pretty and helps with heating/cooling costs.

OK I hung huge bath sheets with a SouthWest design that worked like drapes over two windows in a bedroom so my husband could sleep better. I know, they weren't quilts but worked quite well and were easily washed. I have also seen quilts hung over the windows and the effect was really nice. Kind of like a leaded window effect.

I sew drapery and roman blinds...I made the Roman blind in my family room using silk, blackout and a layer of interlining in between...there are many many types of linings and interlinings available ..it just depends what you want to do..and it really helps the heat/sun...

Interlining is like flannel...in England they call it bump..but it is thicker..I have just recently seen it sold here in Canada and it looks beautiful to add to drapery for warmth and also body...there is also a new product called Thermal Plus All in ONe Blackout...which is the lining with the interlining flannel bonded together...saves times in construction...

Like I said there are so many..I have 3 or 4 sample books of linings alone...

I've been thinking of doing a quilted valance in my kitchen. Doing a quilted curtain in your sewing room seems like a good idea.