One of our first stops on the Great Plains Tour was Carhenge in Alliance, Nebraska. You can see that post here. There were other art pieces to be seen there and here are a few.
It is a shame about the graffiti. I talked with the young lady in the small office/gift shop about it and she said the artist plans to paint over everything again once he gets enough donations to cover the cost of the paint.
The head is made up of two car engine oil pans.
I liked this one
A bench made from truck tailgates. Not that comfortable for a long sit and not something you'd want to sit on during a hot summer day or freezing cold winter day.
As you can see, Carhenge itself is painted a grey to simulate the igneous rock of the original Stonehenge in England.