Concept artist Trevor Claxton has, in addition to working on projects like Magic the Gathering, also lent his talents to games such as Dust 514, EVE Online and Warhawk. If anyone's going to draw awesome mechanical killing machines, it's this guy.
I'm not saying these images come from any of those games. I am saying, though, that they're all magnificent examples of the potentials for explosive death in the not-too-distant future.
You can see more of Trevor's work at his personal blog.