I change mine out every month so they all get a lungful of fresh air.
I use two Jan-March, that is our cold season.
This is Delectable Mountains, the first quilt I sent out, to a quilter in Montana. She quilted flames in gold metallic on the front and a neutral thread for the back.
For the reverse side I'd cut a lot of 18" squares from fabric I was kind of tired of seeing, I think the back is as pretty as the front
