Google a product called Chenille-It. it is a roll of bias cut fabric.
The method I used was to get out my favorite sewing room tool, Elmers Washable School Glue, and tacked the chenille-it down one row at a time because I wanted nice straight lines on the ditch of the sashing. Then sewed that row down and went on to the next row until I finished all I wanted to do.
You can overlay the tape at intersections, you don't have to cut and piece it.
After sewing, I washed the quilt and the chenille frays and softens. I did have to wash mine twice because I was a little heavy-handed with the glue in some places and it didn't all wash out the first time so go light with the glue if you want to try adding it to a quilt.
The anticipation of waiting to see the finished look is worth it. I hope others will give it a try.