1 in 25 variant. Same art as the base issue, in black and white, rotated 90° and enlarged as a wraparound cover.
This issue is a variant of Green Lantern Corps (DC, 2011 series) #16 [Direct Sales].
There exist further variants:
Green Lantern Corps [Green Lantern [B'dg]; Green Lantern [Hal Jordan] (hologram); Green Lantern [John Stewart]; Green Lantern [Mogo]; Green Lantern [Simon Baz]; Green Lantern [Sinestro] (hologram)]; Gerard Gardner; Gloria Gardner; Guy Gardner; Guardians of the Universe; Star Sapphire [Yrra Cynril; also as Fatality]; The Third Army (villains)