I built one out of PVC pipe. It is free standing, can be taken down and stored in a drawstring bag, lightweight, and easily put up anywhere when needed. I got the idea from after seeing "PVC photo backdrops" on line . I covered with a vinyl tablecloth and a piece of flannel. When I can, I am going to purchase a "real" hang on the wall quilt design wall and use it on the PVC frame. My frame is 5 feet wide and about 5 feet tall.
I made a casing in one side of the tablecloth and put the top piece of PVC through it. I had some clamps that I bought to use to attach a quilt sandwich to a table (one idea that didn't work out) and use them to hold the tablecloth flannel to the bottom and sides.
It is up now and I will try to get a picture and post later today if anyone is interested.
Here is a link to what I am talking about but I added a cross piece in the center to add stability, I used the idea of the 2nd one over for mine.
https://www.pinterest.com/pgoforth/pvc-backdrop-stand/