This study focuses on social creativity as manifested in the boundary crossing interactions that take place between educational professionals of diverse disciplinary backgrounds in the course of designing digital educational resources (called 'c-books', c for creative), aiming at fostering mathematical creativity. A socio-technical environment incorporating innovative technology for designing a new genre of authorable e-books (the C-book technology) has allowed designers to interact and communicate with boundary objects supporting the generation, refinement and appropriation of creative ideas, a process that culminated in the production of a c-book on ΄Climate change’. By exploring and supporting these processes, the study has given us important insights into collaborative design that draws on social aspects of creativity.