A novel templated growth process for graphene structures is proposed and demonstrated. Extended, pristine sheets of graphene can be synthesized by additively reacting carbon into a pre-existing graphene sheet which is on a templating substrate through a CVD type process termed "van der Waals templating". Finding a technologically viable synthesis method for planar graphene has recently become of significant interest with the recent recognition of its unusual electronic properties. Various morphological growth patterns such as "pacman" structures and rounded corners are observed which elucidate interesting features of this growth mechanism, linear sheet growths on the order of 150 nm have been produced.