I recently happened upon a great site called WanderMonster, a project of Rob Kimmel Design. WanderMonster features daily "lunch posts," which chronicle post-it notes given by Rob to his son in his lunchbox. Each post-it has a half written story and a half drawn picture. It's up to Rob's son to fill in the blanks, and then they are shared on the website. I think this is such a unique and special way for father and son to share and bond over something every single day and it sparks such creativity!