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Moss Graffiti: Put in blender: one can of cheap beer (or 1 1/2 cups buttermilk), a few handfuls of moss, one teaspoon of sugar. Paint on wall and mist daily until it grows.
Forcing tulips in water is a fun, easy, and a unique way to present tulips that most people have not seen before. I think showing the natural beauty of the bulb is a pure, modern, and minimalist approach to floral design. Give it a try.
Moss graffiti. would be cool for the garden.