I quickly penciled this wonderful exercise from Matt Madden and Jessica Abel's newest publication. You can find Mastering Comics just about any where.
In a nutshell, the exercise is this:
1- start with a page full of 6 panels. Draw abstract shapes in each panel. Don't think about it too much.
2- Next, carve out a scene and a story from each panel. Use the abstract shapes you created to guide you.
3- Add details and voila!
*Yes, the narrative in the first two panels are from Pink Floyd's Comfortably Numb. To be specific, the song came from the collaborative genius of Roger Waters and David Gilmour. Why I started thinking of them while I did this, that's another post . . .