Do some 3D Modelling -- 2

Looking to generate a perspective image that looks as though the ground at a train station has cracked open and there is a fissure. Not expecting an extremely high quality render - low poly design is fine. Really, as long as it looks kind of cool and makes passengers do a double-take as they walk into the station. I've attached an image of the style we're looking to do - although not to this scale. Ideal dimensions would be 3m x 2m - although recommendations as to suiting the perspective requirement would be highly appreciated.