For the final class I decided to be brave and try a fruit filling between the two layers of cake. I made a spice cake and used an apple filling. Fischers sells the fruit filling in bags and you just have to cut the tip of squeeze out the amount you need. Here's instructions on how to do a fruit filling:
First, you pipe a ring around the edge of the bottom layer to keep the filling from seeping out and running down the outside of the cake.