This chapter focuses on a specific, simple strategy to foster active blended learning, a pedagogical approach that values flexibility. The author discusses the use of optional learning activities (OLAs) in graduate courses as a strategy to enable the customisation of the learning pathway and the effective incorporation of formative assessment. A sample of 68 former Master's and doctoral students, who engaged with OLAs, answered an online survey. Their views were predominantly positive. Participants agreed that OLAs promote active, personalised learning, and considered them motivating. Moreover, the number of OLAs completed positively and significantly correlated with final grades. OLAs represent a simple, low-investment way to create engaging, personalised courses. These activities empower students to explore their own interests in a structured, meaningful way. Recommendations for practice are described.