My pebble collection: creating depth

I can hardly resist picking up beautiful pebbles when I'm walking by the lake, or occasionally at the sea. I love all their beautiful colours: white, grey, black, pink or orange. I keep them on a wooden plate and wash them from time to time and rearrange them!

Our composition prompt for today is: create depth.
So here are my pebbles against a soft background of blue patterned material which creates the depth, especially as it's out of focus.