Reminded me of scrunched up brown paper. It could also be a dead leaf though.
The large version is at the preceding link.
Today's Gratitude Item: Getting my walking done early in the morning. That left the rest of the day free to "play" on my computer. It felt really decadent to spend all day "playing" but it was fun! With the senior students now on study leave, I am pretty much on holiday. That is one of the joys of being a substitute teacher.