DC Comics has released the Adam Hughes (tribute to Neal Adams and Superman #233) variant cover to Action Comics #900:
I like it a lot. I especially like the way the broken chain links spell out 900. It's a really iconic look and appropriate for the celebratory nature of a comic book like Action Comics, the book that brought us Superman in 1938, making it to 900 issues. It makes me wonder why the dark and brooding David Finch cover (seen below), which I like as an image, but not as the cover to Action Comics #900, is not the variant.