Your pictures on the theme of 'glass and steel'

Gordon Calder: "I was visiting Liverpool for the first time a few years ago and stumbled across this amazing staircase and escalator combination."

Andy Lawlor photographed the Guggenheim Museum in Bilbao, Spain.

Mateusz Kosto: "I love architecture photography which I started to take almost two years ago. I love looking for extraordinary shapes, perfect form and everything unusual."

Chris Smith: "Steel fabrication has a strong history in the county of Hertfordshire going back to the 1930s post World War One when there was a need for steel and alloy parts for military aircraft and vehicles as well as domestic construction."

Rachel Oldroyd: "This picture was taken at Kew Gardens, looking up through a huge temporary structure representing a beehive."

Helen Copley: "Glass and steel pillars bring light from above into the subterranean Remembrance Hall of the Nagasaki Peace Memorial Hall for the Atomic Bomb Victims. Steel shelves hold books containing the names of the victims. In front of the shelves, tributes such as colourful paper cranes are left on a wooden bench."

Clive Jarman, who took this picture of the Adur Ferry Bridge in Shoreham, West Sussex, says: "Two guys stopped to speak to each other creating ghost-like images."

Ian Watson took this picture of flowers through a train window.

Sarah Keggin: "This picture was taken in Sri Lanka when another train pulled alongside ours at a station. I love the old man's face peeking through the broken glass."

Kevin Johnson took this picture of the Vatican during his studies in Rome.

And finally, Richard Kaye sent us this hand-tinted screen print of a London train station. The next theme is "waiting" and the deadline for your entries is 29 January. If you would like to enter, send your pictures to yourpics@bbc.co.uk. Further details and terms can be found by following the link to "We set the theme, you take the pictures," at the bottom of the page.