Those look great, that's so cool! I love those sorts of creations. And I have a wire feed welder, technically I could make something like this. But I don't have a big assortment of random bits, nor (I fear) do I have the artistic vision to pull it together.
But I think these sorts of projects are really cool. I got some cheap bike chain a while back, was thinking about using that as "stock" to try and weld into some sort of interesting shape.