Use the washers between the pipe and the wall as spacers to allow the pipe to swing freely. Hang a weaving, fabric or vinyl banner, or ribbons from the arm. Make a wall of Sonotube cubbies. Cut the Sonotube into 12 inch lengths and paint or cover with wall paper, as desired. Modify a folding clothes drying rack for art display and storage.
Many programs use clothes drying racks for drying paintings.
The rack can then be used for displaying dimensional art or as shelved storage space. Or mount the rack to a wall for drying space that can be pulled out when needed. You'll need two sanded pieces of 1 inch by 2 inch lumber cut to the length of the space between the rack's kegs, and mounting hardware. Screw the lumber to the rack and then mount the rack to a wall. It is sold in 4 foot by 8 foot sheets and can be cut easily with a saber saw.