I am loving this use of astroturf! It's what we use to replace grass- good old fashioned grass- FYI- There is no substitution!!
I've seen some artists do random past-ups with astroturf- usually relating to the loss of green space in the urban realm. Edible Genius calls his pieces "Topiary Garden Portraits"- which I love! He's been whacking them up all over Brooklyn, and taking pleasure in the fact that people have been taking them home!!
His works have a whole onion layering thing going on- images of 'Ye Old Worlde' portraits- relating back to more simpler times- but I love them at face value.