How about hanging rugs, tapestries or quilts instead of the canvas? Canvas may be OK, but I would think that once they are painted and the paint dries hard, you are just going to have a somewhat reflective surface in front of your acoustic material.
You may also be about to hang some attractive curtain rods and a could of nice ceiling to floor length curtains that match your decor.
TIC
You may also be about to hang some attractive curtain rods and a could of nice ceiling to floor length curtains that match your decor.
TIC