Architecting an LMS - Trying to Build a 'One Size fits Many'

Question to the community. As I work with customers across a variety of programmatic service areas regarding the deployment of an LMS I find myself wanting to get away from customization and begin using some kind of template(s) for those that are in parallel with various 'marketplaces'. Does anyone know of a good resource or resources from a design perspective that could be shared as part of post consult engagements? The focus would preferably be software agnostic but if it covered across several of the more popular platforms that would of course work as well.