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. The end product provided by aspects of the present invention may be a professional-quality ensemble motion graphics video production that may be delivered in any popular format, such as AVI, JPEG, MPEG4 and the like to the customer and or to selected recipients via download or common carrier.