I've seen this alot at craft shows here in NE - they take the glass panes out, then take a sturdy piece of card board or that thicker poster board - and take a piece of an old quilt and stretch it around the "mounting board" staple it to the back nice and flat - insert it into your window frame, then if you want take some brown paper and cover the back like on a picture. The ones I've seen them leave the wood with the paint peeling and weathered - gives it more of an antique look. Some they used the same quilt other ones were made with different ones in each pane. Others were brand new pieces that they they tea dyed to give it an antique look. Good luck and post a pic.