The Birthday Cake, in Ten Easy Steps

I've had quite a few people ask me today how I made Danica's birthday cake, so I figured I would just write how answer here :)
I can't really take the credit for it. I found the idea online somewhere, although I can't remember where exactly. It's called a pinata cake.
I made one for Myka's birthday in July. Compared to how I pictured it turning out in my mind, it turned out terribly. However, it was a hit with the kids and it tasted great. Seeing as I am nowhere near a professional cake decorator, I will take it!
After the experience in July, I figured I would never make one again....until Danica requested the Pinkie Pie version for her birthday (Myka's was Rainbow Dash).
Why do I do this to myself? Lol

Anyways, I wasn't planning in writing a tutorial, so I only have a couple pictures of the finished cake...none of the process. I'll put the process in point form though, and if your are looking for a more detailed tutorial, I'm sure a Google or pinterest search will work :)

How I made the piñata cake: mixed up two white cake mixes.
2. I separated those into four bowls (6 for myka's). I actually just used the same bowl and washed it out as I baked each layer.
3. I used professional food coloring to get vibrant colors for each cake layer
4. I used an 8 inch round cake pan to bake each layer, then carefully take it out if the pan to cool on wax paper. Oiling and flouring of the pan is a must for easy removal!
5. I leveled each cooled layer, then stacked them together, except the top layer, using buttercream between each layer. 
6.I scooped the center out. All the way to the bottom, and about 3 inches across. Getting rid of the scooped out middle was my favorite part :) you don't have to share it with the kids if you don't want to.
7. I poured the skittles in. I used two of the bigger bags. For Myka's I used regular, and for Danica's I used the dessert skittles.
8.I put frosting on the top, then put the top layer on.
9. Frost and decorate the cake however you wish! I used buttercream on both because fondant hates me.
10. Enjoy!