These are parts of real shells I found at the beach.
I cut a tiny piece of plastic, pricked two holes and pulled thread through.
Next I glued the plastic to the shells.
All I have to do now is fasten the threads.
Loose french knots and drizzle stitches made with a variegated DMC floss and of loose threads of the fringe trim.
I thought the herringbone stitches on top of the dune could represent the sunlight on the top.
Later on I removed them.
More buttonhole stitches to create movement in the sea (hm....actually to hide the seam).
All about the "Message in a bottle challenge" can be found here.