Blue food coloring
To make one, use food coloring to tint white frosting light blue and spread it on a cupcake made from your favorite recipe.
With scissors, cut a narrow strip of Airheads taffy for an umbrella handle. Bend up one end and set it on the cupcake.
Cut a half-circle umbrella top from a second piece of taffy (scallop the bottom edge and add decorators' gel ribs, if you like) and place it over the handle. Finally, scatter blue decorators' gel raindrops around the umbrella.