We asked our readers to send in their best pictures on the theme of "monochrome". Here is a selection of the photographs we received from around the world.
A pelican expelling water from its body as it faces the cameraMartyn Longthorn
A close up of a plant covered in water dropletsIan Maggiore
A single flowerTheresa Bennett
A sculpture of a scallop on a beachDavid Belton
A black cat walks along the roof of a whitewashed houseSally Esau
A statue stands in the sea as waves crash on the shoreSean Corlett
A close-up of a ram against a dramatic skyPhil Norton
A nun takes a picture with a cameraGlyn Hands
People lean in together in circle, looking down on the cameraPiyusha Paradkar
A street seen from above as people cast long shadows on the groundUku Sööt
A wet scene outside a cafe in 1970Duncan Grey
Layers of rock can be seen in the mountains of ArizonaDoris Enders
Close up of a dandelionKate Snow
A man walks across a cobbled streetLudo MacAulay
A figure walks past a tomb in a cathedralTony Cook
A close up of a hand holding a chees piece above the chess board with a timer nearbyRoland Trope
A long shadow of a hand on a blank wallEvelyn Oakley
A close-up of a cat's face from the sideEmma Warren
Close-up of toilet rolls gathered togetherElena Raikhlin
The next theme is "my best photo" and the deadline for entries is 18 March.
The pictures will be published later that week and you will be able to find them, along with other galleries, on the In Pictures section of the BBC News website.
You can upload your entries directly here or email them to yourpics@bbc.co.uk.
Terms and conditions apply.
Further details and themes are at: We set the theme, you take the pictures.
All photographs subject to copyright.
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Photography