St. Patrick's Day Cupcakes
1 (18.25 ounce) box cake mix, any flavor 
Chocolate frosting
Green decorator gel 
Green decorator frosting 
Green and white sprinkles 
Green sugar 
Prepare cake batter as directed on package. If desired, make green cupcakes by adding a few drops green food coloring to a prepared white mix. Place paper liners into muffin tin. Fill liners as directed on package. Bake as directed.. Ccool completely before frosting and decorating.
Here are a few simple tips that will help you decorate your holiday cupcakes. 
Sprinkles: Open the container, hold frosted cupcake upside down and dip into the sprinkles. Another option is to roll the outer edge of the cupcake in the sprinkles.
Sugar: Using decorator sugar, follow the same instructions as the sprinkles. The green sugar creates a sparkling blanket effect that is very eye catching! It almost appears to be velvety.
Decorator Gel: Use gel to draw on a shamrock. Shamrocks are simple, think of them as three heart shapes, all three meeting in the middle with their bottom tips. Then simply add a stem.
Combinations: Roll the edges in sprinkles and dip the center in sugar, or vice versa. Or dip edge and decorate center with gel.
Variations:
Another option is to make white icing and tint it green. 
Store cupcakes in a tightly covered container so they do not harden or go stale.