This is a new an contemporary way of doing Graffiti, with moss yes really simple to, go collect a bunch of moss, like 1 liter and then take a can of beer, one egg and 2 table spoon of sugar, put it thru a blender and mix it. Then just goof it on the area where you want the moss to grown. Go back once in a week to goof on some more moss mix, then you will have your own Eco Friendly graffiti. I’m out the door right now check out this site www.crosshatchling.co.uk