Moss graffiti and moss growing with yoghurt, buttermilk or beer seems to be quite a fad now. Everyone posts recipes and how-to videos, but rarely are results ever posted.
Instead of moss, I ended up growing various moulds in my attempt. Likely due to the indoor set up, lack of consistent sunlight, and that the moss was taken from an asphalt base and I had transplanted it onto a soil base with some fertilization.
A 2 week time-lapse, with moss, buttermilk, water, soil,