To begin the recipe, first of all gather together several clumps of moss (moss can usually be found in moist, shady places) and crumble them into a blender. Then add the beer and sugar and blend just long enough to create a smooth, creamy consistency. Now pour the mixture into a plastic container.

Find a suitable damp and shady wall on to which you can apply your moss milkshake. Paint your chosen design onto the wall (either free-hand or using a stencil). If possible try to return to the area over the following weeks to ensure that the mixture is kept moist. Soon the bits of blended moss should begin to re-couperate into a whole rooted plant – maintaining your chosen design before eventually colonising the whole area.