Ever since reading Roberta Horton's book 'The Fabric Makes the Quilt' ( still one of my favourites), I've tried to 'up-the ante' for backs. When I made my quilt ' Creation Myth' following a lot of her principles, I used the black and white fabrics and prints that didn't quite make the front in the backing cloth ( above). I love the excitement of the random placement of stitches when seen from the back.
Likewise in my most recent piece 'Red Remnants' (below) I like the sculptural quality of the red 'darning' marks on the rough twill backing fabric, looking almost like a roadmap.
'Indigo Mine' above) - made by coming up close to where the needle is pushed in rather than by taking a long stitch at the back. It uses far less thread and creates a different texture ( less obvious ridges). I find it easier to vary the length and spacing of the stitch . It probably a proper name that the embroiderers among you will know!
daily art projects last year using used colour catchers, stitching into them then taking rubbings of them, you can see clearly how the stitch is made as the rubbings show front and back at the same time.
'blind stitching' exercise carried out in Dorothy Caldwell's 'Human Marks' was a very valuable experience, the marks made while blindfolded exciting and energetic. In itself the product was pretty ugly so I didn't want to put it in the book I made in the class but wanted to have some record of it included. So again I did rubbings with crayons on colour catchers and cotton organza and capturing the stitches on the back as well , a different picture again.