I mounted a small art quilt on canvas and it was a fun treatment. I stretched and attached canvas to stretcher bars that were bigger than my little quilt by several inches. I wanted to attach the quilt by running stitches so the mounting canvas had to be big enough for the quilt to lay inside the wood stretcher bars that extend inwards on the back side. I painted the canvas a similar color to the background of the art quilt. You can do anything creative here to make the canvas an extension of the design in the quilt. Once it was dry I centered the quilt and tacked it on by taking a tiny stitch next to the edge of the quilt and then a long running stitch on the back of the canvas, etc.
I'm not sure this is the treatment you were refering to, but it may be a fun alternative.
Cindy