Yeah, I'd agree with Travis that some of the pics were odd, but not horribly unsafe. (The tree trunk column comes to mind.) Sometimes unorthodox methods can still work.
A long time ago I was adding a greenhouse wall to an existing patio, and I was lacking about 8" of lumber to finish out the form for the small concrete footing I was building it on. I ended up taking a cardboard box and filling it with dirt, then wedged the box into the footing trench so it'd roughly approximate the rest of the concrete form. I was laughing at myself as I did it, since, at the time, I was a civil engineering inspector, dealing with multi-million dollar concrete jobs. The cardboard box concrete form worked, BTW.
Still, I don't think I'd be putting a light switch in the shower stall.