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moss graffiti: In your blender, combine: * One can of cheap beer or 1 1/2 cups buttermilk * A few handfuls of moss * One teaspoon of sugar. Blend until the mixture is smooth, and you’re ready to get painting! You can use a brush to paint your moss onto concrete walls, rocks, or brick. Mist the moss once a day to help it thrive, and soon your green graffiti will take hold!