Back in November 2013, DC announced they would do steampunk variants for many of their New 52 covers in February. Comic Book Resources got their hands on some of those special covers!
Aquaman #28 variant by Richard Horle
Batman/Superman variant by Tommy Lee Edwards
Flash variant by Howard Chaykin with colors by Jesus Aburtov
Superman #28 variant by Jeff Wamester
Batman and Robin variant by Matteo Scalera
Earth 2 variant by Dan Panosian
Green Lantern: The New Guardians #28 Variant by Klaus Janson with colors by Jose Villarrubia
Justice League #28 variant by Dan Panosian
Nightwing #28 variant by Tommy Lee Edwards
Batwoman variant by Dave Johnson
Superman variant by Dave Johnson
Superman/Wonder Woman #5 variant by Dan Panosian
[via: Comic Book Resources]