If you look really hard you can see all sorts of things in sand. Inspired by the beautiful photos on http://sandgrains.com/Sand-Grains-Gallery.html I used a simple handheld microscope to look more closely at the plastic and sand samples I brought back to London.
This set looks closely at the surfaces of plastic debri, like the surface of strange planets or expensive marbles. In some you can see the growth of coral, using the plastic as a scaffold.
And finally my favourite image, a close up of one of the eighteen toothbrushes picked up along Kamilo beach in a half hour walk.