I first searched online for a yellow cake recipe. I found the recipie for a moist yellow cake at allrecipies.com. The recipe made enough for 3 – 9in round cake pans.
Once the cakes were cooled, I cut off the tops of the cakes to make them nice and even for stacking. To make the cakes blue, I decided to add blue jello to them. I had done this before on a birthday cake I made for myself last year.
What you do is add 1 tablespoon of the jellow mix, to 1/3 cup boiling water, and stir until dissolved. I also added a few drops of blue food coloring to make the blue more bold. Then just pour the jello minxture ontop of the cakes. I did mine in stripes so every piece would have both colors.
I took the cake to work the next day and everybody loved it. The cake had a nice "berry blue" flavor to it that really paired well with the cream cheese frosting!