A tulle sandwich it tulle layered between sheets of Solvy. For those of you who have not used Solvy, it is a form of plastic; you can mark it with Sharpie pens and when you finish sewing on it, you put it in water. I use just room temp water to wash the Solvy away; I'm left with just the stitching. I used several different colors of green threads and used the embroidery hoop to hold my tulle sandwich together to keep the layers of tulle and Solvy from slipping apart. Each segment of the stitching for each section of the ravines on the side of the mountains is numbered; when I cut them out I will be able to put them on the right section of the quilt.
Once I have washed the Solvy away, I am left with the stitching on the tulle. I then remove the tulle with my stencil gun.and I pin it to my quilt. I will sew these on once I get them all done. I am doing that right now with the colored thread stitching.