Wind-eroded rocks on Mars can take many different forms, sometimes resembling common earthly objects. Some good new examples include these long, thin slivers of rock which look like “spoons” and “needles,” seen by the Curiosity rover recently on sols 1089 and 1087. These fragile formations are easier to form in Mars’ weaker gravity and thinner atmosphere and can last much longer than they would on Earth – a unique form of Martian “artwork.”
A curving corrugated sheet found at the center of NASA’s raw image: http://mars.nasa.gov/msl/multimedia/raw/?rawid=1087ML0047760140500015E01_DXXX&s=1087