I have made a few! I sew on an old dining room table onto which is clamped a small pressing station to my right, and on the wall right behind me I tacked up a piece of black quilt batting which is my working design wall...if I am working on a block, all the bits sit in their proper places on this design wall and I work directly off that wall so I do not get confused and sew the wrong bits together. It was really helpful in making my kaleidoscope quilt as I could preview the three variants for each block.
I tacked up a full sized queen batting (also black) on a nearby wall for my main design wall.
I have in the works a third design wall in my quilting room (as the kids moved out I took over the landing and an upstairs bedroom!), one that will be backed with styrofoam insulation so I can pin to the surface as well as get cling from the batting I cover the foam with. This is helpful in spray basting quilts.
I use black quilt batting as my design surface as it really sets off the colours in my fabrics and helps me concentrate on the design. Also the white or natural batting always looks grubby and tatty to me. The black always looks quite "wow".
You can also make a quick design wall by using the fuzzy side of a vinyl picnic tablecloth!
Regards,
Janet