As a special treat for Map Battle 50, YOU get to choose the theme. Create what you ever want with Source. This is your time to show your true skill with the source engine. You can not use previous work, all work must be new. Try creating the most jaw dropping scene and bring out the true beauty of the source engine.
Deadline is the 20th of April, about a month
State the theme of your map
No previous work, all entries must be new material
Three screen shots max
You should use an official Valve Source engine game
Custom content is more than welcome
More rules can be found here
Plenty of time to come up with some creative stuff, good luck and happy mapping!
Post W.I.P. shots and don't forget to mark your final screenshots as FINAL