Best practices for organizing your tiles under fluid pages when you have custom tiles and delivered

We are in the middle of our Tools 8.55 project, and are creating homepages and tiles.  We are current through  FSCM 9.2 image 17.  As we are creating tiles, we have realized we need to have a folder structure under PeopleTools > Portal > Structure and Content > Fluid pages so our users can easily add tiles to their homepages.  We recently received training on Tools 8.55 and the trainer mentioned we should clearly identify our custom tiles.  My question is if we have delivered tiles under the modules (Project Management, Treasury, Travel Expenses, etc)  and we create custom tiles,