Lattice and cheap PVC pipe from the hardware store - would work for displaying so many different things. I like the idea of inserting rods into the ground and placing the pipe over it for outdoor display.
Trellis made of PVC and fence piece. This could be used as a component of your raised garden. I wonder if I could use it as a temporary "fence" visual border by pounding rebar into the ground and placing the vertical PVC poles over it.