Random ideas:
* A cart with a flaming barrel on it (particle effects/fire a no go on such a central focus?)
* A cart with snow on it, as though it sat out overnight before being pushed
* A cart with a battering ram on the front (ram's head, train plow, or sharpened logs varieties -- or all three in one)
* A cart with a small upright missle on it, looking very top-heavy as if it were about to fall over
I'd love to give these a go, but not much time this week. Plus UVmaster pissed me right the hell off last time I was modeling.
Kep