Although materials with structural colours are known to be resistant to photobleaching, the damage caused by structural failure and lack of suitable fabrication methods limit their practical uses. Herein, confinement-mediated self-assembly of colloidal crystals in dynamic borate ester-based networks is demonstrated to produce spherical opal composites using a microfluidic device. The resulting optical beads are flowable and injectable, facilitating injection moulding of three-dimensionally well-defined macroscopic opals. Further, the opal composites formed in semi-spherical sessile microdroplets can serve as individual pixels for two-dimensional patterns integrating angle-independent structural colours and self-healing characteristics. These findings provide novel insights for the development of multi-scale opal constructs with ability to resist the physical damage and to increase the lifetime.