You can use food coloring to make frosting any color.
Manipulating frosting on cupcakes to resemble something like grass is an acquired skill. Fortunately, it is made much simpler by using a piping bag and tip to shape the frosting as you want it to appear. Though these are specialty baking utensils, you can find them in any craft store and many superstores. They are not expensive. Add this to my Recipe Box.
Instructions
1. Select a piping tip with a very small, round opening to make fine, detailed blades of grass. The cardboard label on the tip will have an illustration that shows in what shape the tip pipes.
2. Mix white or cream-colored frosting with green food coloring until it reaches the intensity of color you desire. You can find food coloring in the same area of a store in which you find the piping tools.
3. Scoop the frosting into the piping bag with a spatula. You can find a diagram of this step on the back of the piping bag packaging.
4. Twist the bag at the point where the frosting fills the bag. This will keep frosting from squeezing out of the top while you pipe it on the cupcakes.
5. Aim the tip directly but gently onto the top of a cupcake. Squeeze gently to force out a little frosting. Pull the bag up slowly as the frosting comes out to elongate the blade of grass. Stop squeezing as you continue to lift the bag to taper the end of the grass. The blade should be roughly 1/4 to 1/2 inch in length. Do not squeeze too hard. If you do, you will get a blob of icing instead of a narrow column.
6. Repeat this process to cover the surface of the cupcake.
7. Refrigerate the decorated cupcakes to ensure the frosting does not soften, run, or otherwise lose its detailed shape.
Tags: food coloring, piping with