Inspired by "Giant Crystal" (http://www.thingiverse.com/thing:189703) by Tothe (http://www.thingiverse.com/Tothe/designs). Using modified code written by me in http://www.thingiverse.com/thing:142079.

Number of crystals, minimum and maximum crystal width, crystal height, outcropping (overhang) angle, density, base width and randomization seed value are all customizable.