Recipe (via Stories from Space)

Serves to create several small pieces or 1 large piece of graffiti

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1 can of beer
1/2 teaspoon sugar
Several clumps garden moss

You will also need a plastic container (with lid),  a blender and a paintbrush
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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.