What is it? session 2

This morning my husband dragged me outside to look at a cool thing.  We looked at each other after staring for a while and said, “We need a pictures of this.”  Here it is.We found it outside this morning.

Hint one: We found it outside this morning.

Here is another view.

Hint two: It was not done by a human though it is on something humans use.

Hint three: It is not on a painting or on a window.  It is in a very unusual place and my response when seeing it was “The would make a great blog background but I am not sure I could stomach it.”

I will post the answer to on Monday.