My design wall is 2 (blue) Tyvek insulation foamcore boards, 4' wide x 8' tall from Lowe's. I covered each in Warm and Natural cotton batting, turned to the back and taped down with duct tape.
The boards are attached to the wall with anchor bolts in each corner and one in the middle of each side. (I will be living in this house for a long while, so am not worried about putting the holes in the walls; they can be fairly easily repaired when/if the time comes.)
This gives me an 8' x 8' space to work with. If you work with larger than 96" wide quilts, I'd suggest buying 3 boards -- they are usually less than $20 each -- and cutting one in half lengthwise for an 8' x 10' space.
Jan in VA