If I could pimp any ride in the grimdark, it would be the Landspeeder. Especially with the Typhoon Missile Launchers on there - it's fast and can bring The Rain.
I watched the Ultramarines movie recently, and although I was overall disappointed in the movie I thought the Landspeeder was awesome.
So here's the Frozen Fist Landspeeder:
Ravenwing Support Squad: Typhoon Landspeeder - Multi-melta, Typhoon Missile Launcher