I love the artwork of artist Keron Grant a.k.a Kerong, in particular his concept work for the film industry. Some of the recent projects that he has worked on are Superman: Man of Steel, G.I. Joe: Retaliation, Infamous 1 and 2, Lone Ranger, Robocop and Chronicle.
Design concepts for a few of the vehicles from the film G.I. Joe: Retaliation are shown below and more of his work can be found at his website kerongrant.net