They embedded Synechococcus in 3D-printable hydrogel, which could accumulate biomass via photosynthesis. The material could be made into building facades or wall panels, so you could get depressed when your wall dies because you forgot to feed it nutrients or water it.
Dual carbon sequestration with photosynthetic living materials - Nature Communications
Natural ecosystems efficiently sequester CO2, but containing and controlling living systems remains challenging. Here, the authors engineer a photosynthetic living material for dual CO2 sequestration via biomass accumulation and microbially-induced calcium carbonate precipitation.