Thank you for reminding me of this rainbow technique and for the very helpful hints about how to efficiently do it! I made KA's Emerald Isle cupcakes (mini) as a St. Patrick's treat for my co-workers and was looking for something less time consuming than fondant decorations to top them. I tried the KA vanilla buttercream as suggested which is very well-balanced and used a 12" piping bag since that's what I have today. I found that as long as you pipe out your colors in 10" lines you can easily use a 12" bag (but you have to refill more often). Also, I was able to get great swirls even on minis. These turned out great - thank you!

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