A stone among the pebbles

This week's theme was stone. I completely forgot about it! 

When I first saw the theme, I immediately thought of the smooth stones that I had on my porch, but I was hoping to find something better. Since I forgot and didn't look for any other stone, I went to snap a photo of one of these stones, wondering how I could make the photo more unique.

And I found a stone amidst the smooth pebbles!

(I had moved the stone a bit...)

There had been some piping works being done this week, and it seems like somehow an "outsider" stone managed to find its way here during that time. Together with a small piece of plastic (the red piece).