Head sculpture garden statue/planter. Bring the photo into your lumberyard to get help with a material list (from what I can tell you want a: 10 - 12' wide sona tube - get them to cut it for you if you can't fit in your car, lathe wire/mesh, scrap styrofoam, fasteners of some type, wire & quick set concrete (?) You could model them after easter island statues or...? They look like a cool project.
Upcycle-Styrofoam wig head to garden statue planter. I made this and am so pleased. Used a few different colors but basically the same. I did put live creeping jenny and a small ground cover in the opening and set it out by our pond. Would do another!