I too used 2 pieces of 4'x 8' foam insulation form Home Depot and duct taped them together so that the design wall could be folded when not using the full space. My studio is very small and this gives me more options. A friend came over and we gridded the wall with ribbon at 12" intervals and diagonally ... on both the half wall and the full wall. I hold the wall in place with ribbon from eye hooks screwed into the studs of my studio. I also made a vinyl footing to keep the bottom of the wall cleaner and more dust free.
There are a few tutes on the QB about the making of design walls.