Each month CG Magazine has a new genre or theme. Short story submissions must combine elements of either Science Fiction and/or Fantasy with the current theme. Do not send submissions to upcoming themes, they will be rejected without consideration!
Current theme (April 2014):
20: Time Travel (Submissions: April 1-30. Publication: August 2014)
We hate this theme. Make us love it. Time travel has been done to death. Make it DIFFERENT.
See more at: http://crossedgenres.com/submissions/magazine/