This paper explores the potential of microbial biomineralisation—a biological phenomenon where microorganisms drive mineral formation, generating structures with exceptional mechanical properties—for sustainable design futures. In particular, we discuss how leveraging microbial biomineralisation in designing living artefacts can support regenerative ecologies. Although a few pioneering biodesigners have begun to explore the potentials of microbial biomineralisation for design, a vast design space remains under-explored in the realm of living artefacts. In response, we first characterise a design space by analysing 22 microbial biomineralisation cases from art, design, architecture, materials science, and engineering. We examine the specifics of the organisms and substrates used, the fabrication or growing techniques developed, and the unique design outcomes. Following this, we further analyse these cases through a five-pillar framework of living artefacts for regenerative ecologies, speculating on potential pathways where these cases can be further developed as living artefacts to achieve the specific goals related to these pillars. Our results signal a promising era for designing living artefacts that promote cleaner production practices, foster biodiversity, and cultivate care and sensibilities towards other-than-human entities in our daily lives, by integrating the unique properties of microbial biomineralisation into everyday interactions with living artefacts.