I recently went to the SCOLT conference and saw a workshop on digital storytelling. The presenters did a fantastic job with the stories. I learned that PNG pic files work better for your digital stories because they don't have the outer white shadow boxes. I also learned that there are a lot of free programs to edit pics.
I've put a link to the book I purchased. This book is Maria Tenia Una Llamita...parallel story to Mary Had a Little Lamb. It is a GREAT use of the imperfect with only a few preterite sentences in the end. This is such a manageable resource for Spanish 2.