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.
Martyn Longthorn
Martyn Longthorn: "A pelican making a splash."
Ian Maggiore
Ian Maggiore: "Early morning frost in my back garden."
Theresa Bennett
Theresa Bennett: "To help our garden butterflies, I planted a patio tub with cosmos seeds and was rewarded with a huge show of photogenic pink flowers. I think they make a fantastic monochrome subject."
David Belton
David Belton: "The Aldeburgh Scallop is a sculpture on Aldeburgh beach, in Suffolk. I took this photo whilst on holiday there last year."
Sally Esau
Sally Esau: "This house caught my eye whilst on holiday in Rhodes [Greece]. The gate was open and I could see there was washing hanging on the line and I also noticed the pretty pebbled mosaic pathway. Just as I got my camera ready to take a photo, a black cat strolled across the wall and I managed to capture it in the perfect position. I think the dark gates and the cat add a nice contrast to the image, especially with the monochrome effect."
Sean Corlett
Sean Corlett: "I had always wanted to visit and photograph the art installation on Crosby beach called Another Place, by Antony Gormley. I was travelling back through Liverpool on the way back from a training course and decided to head there. I took this shot with a slow shutter and handheld to give the picture a dreamy look."
Phil Norton
Phil Norton: "A ram stands like a statue as a storm approached Chatsworth House [Derby]."
Glyn Hands
Glyn Hands: "I wonder what the photograph of me that this lady was taking looks like? It would be interesting to compare the two photographs together, capturing a moment in time."
Piyusha Paradkar
Piyusha Paradkar: "Kaleidoscope of family, through light and shadow."
Uku Sööt
Uku Sööt: "Shadows tell a story reality can't."
Duncan Grey
Duncan Grey: "My then girlfriend posed outside a cafe in a London park. The window merged the customers into the path outside in a slightly ghostly way."
Doris Enders
Doris Enders: "Layers of the past. It's taken in the Blue Mesa, in Arizona, which looks in black and white as stunning as in colour."
Kate Snow
Kate Snow: "Dandelions have captured our imagination since we were children, picking and blowing the seeds into the wind. Their beauty does not fade as we age but is simply captured in different ways. Here, I use a macro lens to photograph the detail while allowing some aspects to blur, creating depths and an ethereal feeling as I try to capture the magic of the simple dandelion."
Ludo MacAulay
Ludo MacAulay: "I was trying some street photography in Edinburgh recently and caught this man passing Melville Street."
Tony Cook
Tony Cook: "Sunlight through windows in Hereford Cathedral created a moody atmosphere."
Roland Trope
Roland Trope: "On a May morning, I paused to watch two men playing chess in Central Park [New York]. As one of them lifted his bishop and reached across the board to relocate it as his move, I took the photograph."
Evelyn Oakley
Evelyn Oakley: "I can't resist a patch of sunlight on a white wall and the opportunity it presents for shadow play and monochrome photography."
Emma Warren
Emma Warren: "My monochrome cat sitting still enough to snap, for once - although he's eyeing up his next moment of mischief."
Elena Raikhlin
Elena Raikhlin: "My goal was to transform ordinary household rolls of toilet paperinto abstract paper art by composing texture, light, and shadow."
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.
Martyn Longthorn
Ian Maggiore
Theresa Bennett
David Belton
Sally Esau
Sean Corlett
Phil Norton
Glyn Hands
Piyusha Paradkar
Uku Sööt
Duncan Grey
Doris Enders
Kate Snow
Ludo MacAulay
Tony Cook
Roland Trope
Evelyn Oakley
Emma Warren
Elena Raikhlin