A lovely little activity for a walk. You can do this anywhere - on the beach on the sand using seaweed, stones and shells, in a forest on the floor using flowers, twigs and leaves, on a salt marsh using flowers, plants and shells... as well as somewhere near thistles! Its a lot of fun!
Very simple: gather some flowers, leaves, etc to make a face. Find a thistle (or clear a spot on the ground). Carefully place the objects on/down to make a face. Recreate to show emotions, or to see who can make the funniest face!