While not directly focused on Blender, this video by Brandon Hix will be useful for many of you storymakers out there.
In this tutorial, I talk about the process I use to take an idea that doesn't work yet and turn it into a concept that has more depth, purpose, and tells a story. This is the process I use for all of my 3d illustration projects and is a great practice for anyone looking to spice up their next idea.