My first task on Dig That Gold was to develop the 'world map' of the game. from concept, to marketing materials. Key frames from the island where created to track development and to be over-painted for in game backgrounds or marketing material.
I prototyped, and then created assets for, a system where Island shapes could be created from splines, and combined with height-maps, track shapes and splat maps to generate up to 1000 pseudo-random islands! We later introduced season based themes for more variation.