Hi...I have seen them advertised, and just today, I decided to try my own version: I took gold wire, formed what looked like a large daisy, starting and stopping in the center, pressed it on to the top of a ginger vase so the sides bent down to hold it in place and voila! A package of wire costs about $6 wholesale, comes in many colors, and it didn't take that much, maybe 12-14" or so. It worked well as a grid and the "petals" show around the vase. For this particular arrangement, I used medium stemmed multi-colored roses and myrtle and added a touch of bear grass. I thought it looked rather nice--if I say so myself!
Cheers!
Victoriamary