This is my 4th cake ever. I wanted to play with striping the bag since my instructor brought it up in my class last week. ( Wilton course 1) I am just learning to pipe borders and actually we haven't even had that class yet, but I figured I would try it so ignore the different colors on the bottom shells. I kept turning the bag and didn't realize that would have an effect until I was finished. LOL! I normally ( well, ok once before) make Wilton Buttercream but I wanted to try to use their tub icing.