Abstract: Methods and apparatus are presented concerning network-accessible services that provide post-production digital compositing and motion graphics authoring to users who provide their own core content, which the services supplement via a user-driven interface through the inclusion of digital still images, artwork, video, sound, and/or other supplemental content selected by the user. In one embodiment, following selection and sequencing of the various core and supplemental content components, the services automatically generate and make available to a user a finished product that integrates core and supplemental content. To simplify the compositing task, a series of pre-formatted motion graphics video templates may be made available.