The recipe for the icing is your standard buttercream icing, which is one stick of butter, a little milk, 1 tsp vanilla and about five cups of powered sugar. Because I was going to take these to a pool party and we were going to be outside, I used half buttered flavored Crisco. I didn't want it to melt.
I think they turned out fine and it only took me about an hour and 1/2 from start to finish. I will give you my break down on the cost. The cake mix was $1.25 each, so $2.50 for the mix. The liners were $1.00. I buy powdered sugar in bulk from Sams for around $1.00 a pound and I used 2 pounds. The Crisco ran about $1.25 for the amount I used. I buy butter for $10.00 for 4 pounds and I only used one stick, which is about $.60. I already had the blue coloring. So for less than $7.00 I was able to supply plenty of birthday cupcakes.