Here is the site that Crystal and her photos linked to and I love everything this lady does. I am presently coating sections of the pool noodles with mortar and sticking them on rebar to dry. I think then I will mosaic them and probably add saucers with holes drilled in them as spacers. Don't know yet, still playing with this. I call them totems and Slow is calling them a fence.
Here is a link that might be useful: Totems/fence?