A set of silhouette studies I did for a romp-roaring pair of game concepts: Juggernaut - a racing city destruction mayhem game; and Horizons, a sci-fi platform battler. Neither of the designs got out of the prototyping phase of production, but it was a blast to come up with ideas for them.
I always find hard-surface silhouette design really allows me to focus on blocking forms, and lets my creative intuition rapidly jump from one weapon design to the next.