Preheat oven to 350 degrees and line muffin tin with paper liners (this recipe will make 24 cupcakes, so you may need to do two batches)
Whisk dry ingredients together: cake mix, flour, sugar and salt
Mix wet ingredients together: water, sour cream, vegetable oil, eggs & extract
Blend wet and dry together for 1-2 minutes
Fill paper cups 3/4 full and bake until set (12-15 minutes)
While cupcakes are baking and cooling, blend frosting ingredients together until smooth
portion 1 cup of white frosting aside in a small bowl
Add 6-8 drops of green food coloring to the remaining batch of frosting
When cupcakes are cooled pipe or spread green frosting onto cupcakes
Cut airhead rainbow candies in half, and push into green frosting to secure in a rainbow shape
Pipe or dot (ziplock bag works well) white frosting 'clouds' next to rainbow candies
Unwrap chocolate Rollo candies, dust the bottom with edible gold glitter spray and secure in the frosting next to the rainbow rope as a pot of gold