Jack Dykinga / Purplemat (Nama demissum) and California goldfields (Lasthenia californica) growing through pebbles of a dry streambed. Joshua Tree National Park, Mojave Desert, California, USA. 25th March 2019.

Steven David Miller / Great bowerbird (Chlamydera nuchalis), male showing off treasures whilst female inspects bower. Lake Argyle, Kununurra, Western Australia.

Guy Edwardes / Portland Bill Lighthouse, Isle of Portland, Dorset, England, UK. November 2015.

Guy Edwardes / Porth Nanven, Cot Valley, Porth Nanven, Cornwall, England, UK. September 2017.

Olga Kamenskaya / Pebbles reflected in the water surface at mouth of Sheryldy river, Lake Baikal, Siberia, Russia. September

Alex Mustard / A shoal of Golden grey mullet (Liza aurata) swim in the surf breaking on the shore of El Hierro Island. Canary Islands, Spain. East Atlantic Ocean.

Floris van Breugel / Glass beach at sunset - a former dump site, in which the glass has now become pebbles of sea glass. MacKerricher State Park. California. USA. January 2013

Theo Bosboom / Cushion pink (Silene acaulis) in highlands, A?xarfjardarheidi, Iceland, June

Sven Zacek,Sven Zacek / Waves along the Baltic Sea coast of Northern Estonia. January 2012.

Philippe Clement / Fossils of belemnites and ammonites on shingle beach near Lyme Regis along the Jurassic Coast, Dorset, UK, November 2012

Sandra Bartocha / Waves of Baltic Sea washing over and polishing coloured pebbles, Markgrafenheide, Mecklenburg-Vorpommern, Germany, January

Sandra Bartocha / Waves of the Baltic sea washing over pebbles creating a rainbow from the spray, Nienhagen, Germany, April