In this paper we describe our experience in designing an application to support children in producing their stories in a formal setting, a primary school. In particular, we reflect on the implications of our findings on levels of creativity found in the produced stories. Besides, we compare two versions of our application: one is text-based and the other is image-rich. Feedback from teachers and children is presented and discussed in terms of implications for the design. We will then use our experience to revise the existing guidelines to design authoring tools to stimulate creativity. © 2015 ACM.