I am a big fan of teacher-created materials. I think this approach to lesson implementation is especially helpful in this day and age when teachers need to provide lesson materials that are relevant to a variety of complex and changing demands (e.g standards reform, diverse learning needs, classroom resources, admin policies, etc.).
In this effort to provide customized curriculum materials, I recommend checking out PBS' new teacher tools which includes a Lesson Builder and Story Mapping tool. What is wonderful about these design tools is you can quickly pull from all the PBS resources (Design Squad, Frontline, etc.) and plug them into your lesson materials. The user interface is simple to use and this resource is free!