In this paper, we present our experience, while working in the MC Squared project, with the design of educational digital resources aiming at promoting creative mathematical thinking among undergraduate students. The resources, called “c-books” (c for creative), are produced within an innovative socio-technological environment by a community gathering together, computer scientists and researchers in mathematics and mathematics education. The paper highlights the importance of teaching loci curves at undergraduate level as an introduction to implicit equations. It presents the design choices providing the c-book with affordances to promote creativity in mathematics in terms of personalized non-linear path, constructivist approach, autonomous learning, and meta-cognition based activities, among others.