This trendy sprinkle fault line cake is made with layers of homemade vanilla cake, Italian meringue buttercream and colorful sprinkles. Fault Line Cake Trend Fault line cakes are all the rage right now. I've seen fault line cakes with everything from sprinkles to buttercream flowers to real fruit. I just had to try out this new technique. Although my first fault line cake wasn't perfect, I wanted to show you what I learned in the process. I love how this trend allows you to be creative and really add something to the middle of the cake to make it ...