Moss graffiti - mix yogurt, water and live moss in a blender, then paint onto a wall. Moss will grow in the shape of whatever you painted. Just remember to spritz it with water every once in a while to keep it alive.
so cool! Moss paint: You’ll need several handfuls of moss, 12oz of buttermilk or a can of beer and a teaspoon of sugar. Mix in a blender until liquid and paint on the wall. Spray daily as it grows, as moss thrives when moist.