Plastic bottle caps = art.
These caps are nailed to a pole in Ellensburg, Washington, at the folk art site known as Dick and Jane’s Spot. Info about Dick and Jane, and the Spot, a.k.a. their home, can be found here.
See the "plastic" subset of the Unconsumption archive for more plastic-turned-art examples.
(Photo by woodendesigner on Flickr.)